A drifter to another world, where high school students are thrown into an unknown world with their entire school.

After school, a major earthquake suddenly hits the high school students.

When they wake up, they find themselves thrown into a world where they don't know where they are, with their entire school.

The school has become a maze. Strange creatures they've never seen before appear.

Everyone around them is trying to kill them. For what purpose?

How can the students return to their world?

They wander around the school, which has become a demonic realm, searching for the answers.