Atelier Yumia The Alchemist of Memories nude mods request

[Dewizard]

57 minutes ago, td-ok said:

I tried to edit an iB.vb file using the 3dmigoto plugin in Blender 4.4.
However, I got a loading error.
Please let me know if you know how to solve this problem.

Same error here, in my case it only renders the jacket and few other details... don't know how to fix it

[amorrow28]

Ok, I have written a lot of code since this game came out a few days ago!  First, I am going to talk about how to combine mods, for end users.

 

To combine mods, each mod needs to have a corresponding .yumiamod.json file.  For my skirt removal mod and for my bikini mod, please download the .yumiamod.json files from their original posts, which have been updated.  (The file is different depending on which version of the mod you are using, because the topless versions have an extra texture.)  If you'd like to try combining with the PS4/PS5 button mod, grab the 0x77777777.fdata from here and use my 0x77777777.yumiamod.json here:  (Also, if you want Switch buttons instead, go here.)

 

0x77777777.yumiamod.json.zip

 

Steps to combine mods:

1. If you already have mods installed, please restore your original root.rdb and root.rdx files!!  My tool will make a backup of the originals, so you only need to do this once.
2. Download yumia_mod_insert_into_rdb.exe and place it in your {Steam Folder}/Atelier Yumia/Motor/ folder.
3. Place your mods' .fdata files and .yumiamod.json files into your {Steam Folder}/Atelier Yumia/Motor/ folder.  (If your mods come with root.rdb and root.rdx, do NOT use those / copy those, we will be making our own!)
4. Run yumia_mod_insert_into_rdb.exe.  You are done!
5. If your mods disappear after an official update, then root.rdb and root.rdx may have been updated.  In that case, delete root.rdb.original and root.rdx.original and run yumia_mod_insert_into_rdb.exe again to generate new backups and re-insert your mods.  Do not simply run the program again because it will use the old backups which may lead to crashes.  EDIT: As of v1.1.3 of the tools, yumia_mod_insert_into_rdb.exe will now detect updates and automatically replace the backups / re-insert the mods (the user will be prompted first) when run after a game update.

 

How to convert mods from PC to Switch / PS4 etc: Run yumia_mod_update_mod_metadata.exe prior to yumia_mod_insert_into_rdb.exe to replace mod metadata.  (Only Switch has been confirmed, and not every mod has been successfully ported, so YMMV.)

 

Enjoy!

Edited February 11 by amorrow28

[amorrow28]

Ok, let's talk about how to mod this game!  Thank you to @jmedia7 for helping me figure out a few things, and DeathChaos25 and eterniti (vagonumero13) for sharing their findings about fdata, rdb, rdx, rnk, etc.  KT has not made this easy for us!

 

Tools:

1. First, you will need a copy of the full set of yumia_fdata_tools.
2. You will also want to get qrdbtool, which you can get from jmedia7's Rise of the Ronin mod loader.  
3. For texture mods, grab Gust Tools.  Edit: Gust Tools cannot handle all of the textures, consider using g1ttools which comes with jmedia's Rise of the Ronin mod loader (which you downloaded for qrdbtool).
4. For mesh mods, grab my G1M exporter - I updated this to v1.3.14 which adds Atelier Yumia support, so be sure to update!
5. You need a list of files, because working with hashes is insane.  Luckily, KT included a file list in the demo version of the game, so I cleaned it up, here it is:

Yumia_filenames.zip

 

Yumia Demo fdata files from DeathChaos25 - Also, to make your life easier, put these .fdata files into your {Steam Folder}/Atelier Yumia/Motor/ folder - it will restore about 60% of the filenames for qrdbtool!  (Taken from the demo)

Instructions:

1. Figure out what file you want to mod, using my file list (you can open it in notepad, ms excel, google sheets, libre office, anything you want).  For example, if you want to mod one of the main characters, they are "R_G1M - pc00_00" through "R_G1M - pc05_00".  Yumia is "R_G1M - pc00_00", which when you look in my file list is 0xa34c62fc.  Note: This game no longer uses a single .g1t file for each .g1m file.  Instead, texture assignments are inside the .ktid file; for example Yumia's g1m uses "R_KTID - pc00_00" (pc00_00.ktid).  I have not figured out how the assignments are made, so you will have to find the texture files you want.  Yumia's textures start with "R_G1T - MPR_D_Seeker_Character_pc0000_" so they are easy to find in my file list.  EDIT: I now have instructions for finding .g1t files here.
2. Run qrdbtool, and open up {Steam Folder}/Atelier Yumia/Motor/root.rdb.  (NOTE - If you have mods installed, this tool will pull your modded files instead of the originals!)
3. In the "Find:" box at the top, type in the hash you got from the file list.  For example, to get Yumia, type in "0xa34c62fc" without the quotes.  Select the file, and extract it.  (You can also manually unpack .fdata files with yumia_mod_extract_files_from_fdata.py)  Repeat this to get all the files you need for your mod.
4. Modify the files as you like.  For learning G1M and G1T modding, see my Atelier modding tutorial. For g1m, be sure to update the g1m exporter to v1.3.14 or newer. You need to use the tool to remove extra blend indices before importing into blender, and to add them back in after export from blender.  For g1t, mod as normal, but normal maps have their colors inverted for some reason.
5. Now we need the files' metadata so that we can re-insert it back into the game.  Put yumia_mod_find_metadata.py in your {Steam Folder}/Atelier Yumia/Motor/ folder.  Run that and type in the 8 digit hex code (without the 0x).  Again, for Yumia's g1m, type in "a34c62fc" without the quotes.  It will dump out a file called a34c62fc.file_metadata.json.  Repeat until you have metadata for all the files you modded.
6. Put those file in a folder with your modded files (e.g. 0xA34C62FC.g1m) and yumia_mod_write_yumiamod_json.py, yumia_mod_write_fdata_files.py and yumia_mod_lib.py.
7. Run yumia_mod_write_yumiamod_json.py.  It will first ask you for an 8-digit hexadecimal code of your choice to name your fdata file.  Pick a hex number that does not exist in {Steam Folder}/Atelier Yumia/Motor/.  (For example, in my mod, I used 88888888 because 0x88888888.fdata did not already exist).  Then it will ask you for the names of the files.  You can just drag your files right into the window and then press enter.  For example, when it asks you what the file name is for 0xA34C62FC, just drag 0xA34C62FC.g1m into the window and press Enter.  This will repeat for every .file_metadata.json in the folder.  When you are done, you should have a new .yumiamod.json file (for my example, I would get 0x88888888.yumiamod.json).
8. Run yumia_mod_write_fdata_files.py, and it will use your .yumiamod.json file to pack up a new .fdata file for you.  (for my example, I would get 0x88888888.fdata).
9. Finally, use my instructions for end users in the post right above this one to insert your fdata file into the game.  (You can use yumia_mod_insert_into_rdb.py instead of the .exe version, just be sure yumia_mod_lib.py is also in the folder.)

 

I hope there will be a lot of modding for this game.  Enjoy!

 

Edited February 14 by amorrow28

[nudefinder]

Yeah imma wanna see hot gurls with real pussy

[Sky503503]

Do you think it is possible to add or boost jiggle physics to the game? It already exists but it doesn't apply to most animation.

[juanpiolavago]

7 hours ago, ddtddt said:

Dado que los zapatos de Yumia son parte de su ataque, espero que el futuro mod que obtengamos para este juego tenga una opción semidesnuda para mantener los zapatos puestos también, solo por algunas razones. 

And the shoes... Does it take away so much from the immersion that I don't have them?
I've played with the mod and I haven't seen that any animation is out of place if you don't have them.

[juanpiolavago]

3 minutes ago, gggnog said:

 

He realizado algunas modificaciones ligeras al mod de bikini y lo lanzaré como una versión beta.

 No pude quitar las líneas de las bragas, así que cambié la forma de los pechos y añadí genitales. También hice algunos cambios leves en la textura.

 Debería funcionar con el método de instalación descrito anteriormente. Aún no entiendo bien la herramienta, así que avísame si tienes algún problema.  

Tenga en cuenta que no acepto solicitudes.

 

yumia_seminude.beta.rar 2,66 MB · 0 descargas

I honestly prefer the beta mod to this modification.
I find that it looks ugly that the pussy is seen from the panty as if they had cut just that part.
Even the lines are more preferable even if they take away some of the immersion.

[amorrow28]

7 minutes ago, cyn_mod said:

I got it to work without rewriting the fmt, but there may be problems with different titles.
Unlike before, modifying outlines is not yet supported.

blender_3dmigoto_cyn v4beta.zip 32.5 kB · 2 downloads

 

If you upgrade to the latest version of my g1m exporter (v1.3.14), you should not need a custom plugin.  Just use yumia_g1m_remove_excess_blendindices.py prior to Blender import and yumia_g1m_restore_original_fmts.py when you are done and ready to make the G1M.

[amorrow28]

 

I can't be the only one who uses a controller with the Nintendo Switch layout...  I made a mod similar to the PS4/PS5 controller mod, but with Switch controller icons instead.  Download here!

[cyn_mod]

10 minutes ago, amorrow28 said:

 

If you upgrade to the latest version of my g1m exporter (v1.3.14), you should not need a custom plugin.  Just use yumia_g1m_remove_excess_blendindices.py prior to Blender import and yumia_g1m_restore_original_fmts.py when you are done and ready to make the G1M.

I think it works for both.
I made this for those who want to make it easy, because it needs to be changed to handle the 7th weight and to generate an error when the number of weights is too large.

 

thank you for update tools!

[amorrow28]

1 hour ago, cyn_mod said:

I think it works for both.
I made this for those who want to make it easy, because it needs to be changed to handle the 7th weight and to generate an error when the number of weights is too large.

 

thank you for update tools!

thank you. I did not look carefully at your modification. Some models actually do use the second set of weights, does your plugin handle that?

[cyn_mod]

29 minutes ago, amorrow28 said:

thank you. I did not look carefully at your modification. Some models actually do use the second set of weights, does your plugin handle that?

I was unaware that the length of the second set was variable.
I will turn it off until I fix it. 

[greedo75]

5 hours ago, amorrow28 said:

Ok, I have written a lot of code since this game came out a few days ago!  First, I am going to talk about how to combine mods, for end users.

 

To combine mods, each mod needs to have a corresponding .yumiamod.json file.  For my skirt removal mod and for my bikini mod, please download the .yumiamod.json files from their original posts, which have been updated.  (The file is different depending on which version of the mod you are using, because the topless versions have an extra texture.)  If you'd like to try combining with the PS4/PS5 button mod, grab the 0x77777777.fdata from here and use my 0x77777777.yumiamod.json here:

 

0x77777777.yumiamod.json.zip 391 B · 33 downloads

 

Steps to combine mods:

1. If you already have mods installed, please restore your original root.rdb and root.rdx files!!  My tool will make a backup of the originals, so you only need to do this once.
2. Download yumia_mod_insert_into_rdb.exe and place it in your {Steam Folder}/Atelier Yumia/Motor/ folder.
3. Place your mods' .fdata files and .yumiamod.json files into your {Steam Folder}/Atelier Yumia/Motor/ folder.  (If your mods come with root.rdb and root.rdx, do NOT use those / copy those, we will be making our own!)
4. Run yumia_mod_insert_into_rdb.exe.  You are done!
5. If your mods disappear after an official update, then root.rdb and root.rdx may have been updated.  In that case, delete root.rdb.original and root.rdx.original and run yumia_mod_insert_into_rdb.exe again to generate new backups and re-insert your mods.  Do not simply run the program again because it will use the old backups which may lead to crashes.

Enjoy!

 

After doing the steps above, using your 0x77777777.yumiamod.json file (above) crashes the game (it won't load).  Using your original one (0x88888888.yumiamod.json) works great. But no PS icons. What am I missing?

Edited March 23, 2025 by greedo75

[_QED]

6 hours ago, amorrow28 said:

Ok, let's talk about how to mod this game!  Thank you to @jmedia7 for helping me figure out a few things, and DeathChaos25 and eterniti (vagonumero13) for sharing their findings about fdata, rdb, rdx, rnk, etc.  KT has not made this easy for us!

In the past, I too attempted to write code, but your knowledge, skills and exceptional processing speed are far beyond my reach, leaving me in awe that words cannot adequately express.

(Under the impression that developing a tool would require a significant investment of time, I engaged in creating mods for another game, which proved to be a pleasurable undertaking, lol.)

I would like to extend my heartfelt gratitude and utmost respect to you for providing such an extraordinary tool.

 (Translated by DeepL)

[cyn_mod]

Even though the fmt of BLENDWEIGHT is the same, as in 6.vb and 7.vb of A34C62FC.g1m,
Sometimes, as in 6.vb, the 5th weight is handled by the SemanticIndex:1 of BLENDINDICES.

 

The old one had a fixed BLENDWEIGHT of R32G32B32 and BLENDINDICES of R8G8B8A8, so adding the missing 4th weight was easy.

 

Instead of removing BLENDINDICES, add it to BLENDWEIGHT to match the length, and refer to original.fmt when importing to remove BLENDWEIGHT.
Rewrite VERTEX_ATTRIBUTES(0x2FD0E8-), filesize and chunksize.
Match the BLENDWEIGHT in blender_3dmigoto.py.

 

I don't know if it will work, but one of them will need to be fixed.

[amorrow28]

 

One more mod for the weekend!  I was not planning to do this, since I wanted to work on tools, but I changed my mind.  This is a port of the legendary nude mod from Moderchan, and I am very thankful to use it.  (I do not know how to reach him {they?} to ask permission, so if he asks me to take it down, I will.  I hope he does not mind!)  I sculpted the body shape to match Yumia.  Disclaimer: Obviously I do not own and do not claim ownership of any of the assets used in the making of this mod.

 

Update: This mod now includes all four women!  This version is for PC only, for other platforms see here.

 

This file replaces the default costumes:

 

AtelierYumiaNudeMod.7z

 

This file replaces the camping costumes {light costumes}:  (Use both so that they are nude in and out of camping, or use partially nude for regular and nude for camping, like me!)  The camp version is already multiplatform ready, for instructions for Switch etc see here.

 

AtelierYumiaNudeCampMod.7z

 

OLD:

Yumia_Nude_v1.1.7z - OBSOLETE

 

 Instructions:

Quote

 

Copy the contents of the Motor folder into the Motor folder of your Atelier Yumia folder, and run yumia_mod_insert_into_rdb.exe (included) to inject the mods into your root.rdb and root.rdx files.  (I recommend starting from a fresh install.)  See instructions here on how to install mods and combine mods.  If the game updates and the mods disappear, do not just run yumia_mod_insert_into_rdb.exe again - first delete root.rdb.original and root.rdx.original and then run yumia_mod_insert_into_rdb.exe.

 

You are welcome to use the Yumia Easy Mod Manager from @MangetsuC if you want, be sure to use the latest version.

 

If you want to remove the plush doll on Yumia's hip, grab the mod here.

 

Notes:

This mod will destroy the palette swap DLC clothes, but other DLC should mostly work.

 

Original banner, now a bonus screenshot:

Spoiler

 

 

 

 

My other Atelier mods:

• Atelier Ryza - Summer Mod
• Atelier Ryza 2 - Breezy Mod, Summer Mod, Fully Nude Mod
• Atelier Ryza 3 - Summer Mod, Fully Nude Mod
• Atelier Sophie 2 - Revealing and Fully Nude Mods
• Atelier Yumia - Revealing Mod

 

Also, interested in modifying these to make your own mod?  My nude mod build files are available for download here.

 

Enjoy!

Edited November 21, 2025 by amorrow28

[Scarecrow03]

5 minutes ago, amorrow28 said:

 

One more mod for the weekend!  I was not planning to do this, since I wanted to work on tools, but I changed my mind.  This is a port of the legendary nude mod from Moderchan, and I am very thankful to use it.  (I do not know how to reach him {they?} to ask permission, so if he asks me to take it down, I will.  I hope he does not mind!)  I sculpted the body shape to match Yumia.

 

Yumia_Nude.7z 8.38 MB · 8 downloads

 

Instructions:

Backup your Motor/root.rdb and Motor/root.rdx files, then copy my files in.  If you would like to combine mods, a .yumiamod.json file is included, see instructions here.

Looks great, i will use this until someone make a semi nude mod. There is something about having clothes but exposed nudity that i dont understand why i like it. The best semi nude mods that i have seen are from fire emblem engage and granblue fantasy versus rising

[amorrow28]

4 hours ago, greedo75 said:

 

After doing the steps above, using your 0x77777777.yumiamod.json file (above) crashes the game (it won't load).  Using your original one (0x88888888.yumiamod.json) works great. But no PS icons. What am I missing?

 

Sorry, I do not know.  I tried using both the PS4 and PS5 versions of the mod, and both work fine for me.  Did you make sure to restore the original root.rdb & root.rdx files before using my tools, and you included both 0x77777777.yumiamod.json and 0x77777777.fdata, as well as 0x88888888.yumiamod.json and 0x88888888.fdata?

[greedo75]

35 minutes ago, amorrow28 said:

 

Sorry, I do not know.  I tried using both the PS4 and PS5 versions of the mod, and both work fine for me.  Did you make sure to restore the original root.rdb & root.rdx files before using my tools, and you included both 0x77777777.yumiamod.json and 0x77777777.fdata, as well as 0x88888888.yumiamod.json and 0x88888888.fdata?

 

I completely uninstalled the game. Deleted the folder (to make sure all the files were gone). Then I reinstalled it. That way I would have the original root.* files in the Motor folder. I launched the game to make sure it loaded (it did).

Then I copied the four files listed above (the sevens & eights) to the Motor folder. I copied your "yumia_mod_insert_into_rdb" executable there as well. The I ran your executable and started the game. It crashed.

The game loads with the eights, but not the sevens. Here is a screenshot of the files I copied to the Motor folder.

 

Edited March 24, 2025 by greedo75

[juanpiolavago]

34 minutes ago, amorrow28 said:

 

Lo siento, no lo sé. Intenté usar las versiones de PS4 y PS5 del mod y ambas me funcionaron bien. ¿Te aseguraste de restaurar los archivos root.rdb y root.rdx originales antes de usar mis herramientas? ¿Incluiste 0x77777777.yumiamod.json y 0x77777777.fdata, así como 0x88888888.yumiamod.json y 0x88888888.fdata?

Does it work on ps4 just by putting the mod files in the pkg?

[amorrow28]

7 minutes ago, greedo75 said:

 

I completely uninstalled the game. Deleted the folder (to make sure all the files were gone). Then I reinstalled it. That way I would have the original root.* files in the Motor folder. I launched the game to make sure it loaded (it did).

Then I copied the four files listed above (the sevens & eights) to the Motor folder. I copied your "yumia_mod_insert_into_rdb" executable there as well. The I ran your executable and started the game. It crashed.

The game loads with the eights, but not the sevens. Here is a screenshot of the files I copied to the Motor folder.

 

 

That does look correct.  I don't know if anyone else has had any issues, but I tested both the PS4 icons and PS5 icons and they both worked fine.  Did you try the Switch icons?  I made that fdata file myself, unlike the PS4/PS5 icons.  If that works, then that gives us some information.

 

7 minutes ago, juanpiolavago said:

Does it work on ps4 just by putting the mod files in the pkg?

 

The mods are for PC only.  Are you talking about the PS4/PS5 icons mod?

[juanpiolavago]

44 minutes ago, amorrow28 said:

 

Parece correcto. No sé si alguien más ha tenido problemas, pero probé los íconos de PS4 y PS5 y ambos funcionaron correctamente. ¿Probaste los íconos de Switch? Creé ese archivo fdata yo mismo, a diferencia de los íconos de PS4/PS5. Si funciona, nos dará información.

 

 

Los mods son solo para PC. ¿Te refieres al mod de iconos de PS4/PS5?

I thought you were talking about the ps4 version of the mod, because on pc the optimization of the game is a disaster.

 

 

Hell, I even spend less resources on my RTX 3060 using Yuzu, Citron or any SWITCH emulator.

[greedo75]

1 hour ago, amorrow28 said:

 

That does look correct.  I don't know if anyone else has had any issues, but I tested both the PS4 icons and PS5 icons and they both worked fine.  Did you try the Switch icons?  I made that fdata file myself, unlike the PS4/PS5 icons.  If that works, then that gives us some information.

 

 

The mods are for PC only.  Are you talking about the PS4/PS5 icons mod?

You wrote, "Did you try the Switch icons? I made that fdata file myself."  Where is that file? I do not see it in this thread. 

What's interesting is the game is currently showing Switch icons. For example, in the game, X = Gather (which on a PS controller is triangle). It's messing me up. If I try your fdata file for Switch, aren't I back at square one?

But I would like to make the attempt, just to see it the game crashes.
 

 

Edited March 24, 2025 by greedo75

[M0dM0d]

2 hours ago, amorrow28 said:

 

One more mod for the weekend!  I was not planning to do this, since I wanted to work on tools, but I changed my mind.  This is a port of the legendary nude mod from Moderchan, and I am very thankful to use it.  (I do not know how to reach him {they?} to ask permission, so if he asks me to take it down, I will.  I hope he does not mind!)  I sculpted the body shape to match Yumia.

 

Yumia_Nude.7z 8.38 MB · 187 downloads

 

Instructions:

Backup your Motor/root.rdb and Motor/root.rdx files, then copy my files in.  If you would like to combine mods, a .yumiamod.json file is included, see instructions here.

 

Note:

I still have no idea how to add new textures to the game, if it is possible at all.  So I had to replace the skin texture (obviously), which completely ruins the "Alchemist's Survey Attire (Light)" outfit.  But, I guess, if you want to use an outfit with clothes, remove this mod first?

incredible work, I can't wait for someone to sculpt some Raiza thighs on her.

[amorrow28]

15 minutes ago, greedo75 said:

You wrote, "Did you try the Switch icons? I made that fdata file myself."  Where is that file? I do not see it in this thread. 

What's interesting is the game is currently showing Switch icons. For example, in the game, X = Gather (which on a PS controller is triangle). It's messing me up. If I try your fdata file for Switch, aren't I back at square one?

But I would like to make the attempt, just to see it the game crashes.
 

 

https://www.loverslab.com/topic/247708-atelier-yumia-the-alchemist-of-memories-nude-mods-request/page/3/#findComment-6983885