In a bustling city of Japan,a ring of a bell can be heard and students walking.

The teacher walks in the classroom laying down his books on the front desk.

Until.. they all became nauseous and then they collapse to the floor one.. by one.

And then woked up in a room.. suddenly something that looks like a flat digital screen appear in front of them as they are still trying to comprehend what happend.

There behold a screen containing names of difficulties [easy] [normal] [hard] [Insane]

And then without a time to choose they are given a random difficulties

T0 be c0ntinued