REVIVAL RESET

Japan, Aichi Prefecture, Central Nagoya.
One day in July, just before the summer break, Yuuma Takise, an introvert student who was experiencing a solitary and gloomy high school life, encountered a strange creature named Belb.
He could float, slip through walls, and even make things appear out of thin air... Belb, who nonchalantly showed off these strange powers, asked Yuuma to search for a certain game cartridge.
Just what was on this game cartridge--?

[From Steam]