This is a fanservice sports game by Honey ∞ Parade Games for Android / PC. I know there is a related topic here but I'm making a new topic dedicated to these lza files.

These files seems related to lzs compressed files but I didn't manage to extract / decompress these lza files. So I'm providing some lza files if anyone more experienced in this kind of thing to help.

Download link for the lza (and related lzs) : https://drive.google.com/file/d/1yInVK6pWv8EonjhZ6O2uVV7VKnIchgZX/view?usp=sharing

I'm also very interested in getting these extracted but don't know enough to make any progress.

check the other topic, the source code for the tools to extract the files is available there, other than that there's no plugin/script to handle the models.

So it seems we now have all the tools needed to extract the encrypted files and view the models:

https://mega.nz/folder/waRAnbyB#xdkfXX09uorfrfpOgHqkdA

the bum format is being used in another game called Story of Seasons A Wonderful Life and in the Discord server someone named Dahni figured out the format to some extent, the bones don't work to a 100% but I'm sure someone will figure it out 😉

I made a blender addon to import models, textures and animations for dolphin wave and other games that used the same engine.
it can import lzs and lza files as is. You don't need to decrypt or decompress the files
https://github.com/Al-Hydra/blenderBUM