Hikaei!

In 200X, Yuta accidentally gets "Inrou", a case for holding small objects, that makes any wish come true. According to the instruction manual, this "Inrou" works only when used by "Game" style. Yuta follows this instruction and plays "Inrou Game" with his classmates. To his surprise, "Inrou" works properly! The game gets heating up and they get bolder....