(sorry for image/font sizes, writing from phone)
I somehow managed to find some files that has at least one readable text when encoding was set to Shift_jis or UTF-8: unityFS 5.x.x..
But this file itself has no extention at all, and I failed to open it in any file extension suggested by online extention identifier.
About the game - check this: https://imgur.com/a/qLDTr
As you see, this is VR cappable Japan gatcha-type game. This is on low setting, sorry for that.
this android game downloads files when it need to be loaded on-screen, which can be motion, Image, model, voice. and it lands on this directory shown in above image - octo/v1/1~F/4..../ with .meta file which is unreadable in any encoding.
Even if there is thousands of files in each directory, I think I can identify role of those files with size(which range from KB to MB), and time. So that doesn't matter.
Therefore, my question will be: How I'm gonna open it?
(again, sorry for image size, I only know wiki grammars)