Lost Japanese videogame I found in my basement

Gameplay of a cursed videogame

2021

 
 

I don’t know Japanese, but I think this game is about the evil side characters getting their own videogame.

 

I tried to translate a Japanese note written on the back side of the cover:

Fun fact! While the main game is 3D rendered, machine learning and other techniques have been used to upgrade the user experience. 

I uploaded the official soundtrack here.

I also found some sketches inside the cover: