You get hit on the head and wake up. Oh, but you had such a pleasant dream... Although you can't remember the dream anymore.

Looking around, you realized that you were... at school? The teacher looks at you with displeasure because you fell asleep. However. This is not your class. It's not even your school. You have no idea who all these people are.

Suddenly you have a headache. The information appeared in your head. You are in a parallel reality where there has been a war with ghosts for many years. Some territories that were human were destroyed, others were inhabited by ghosts.

But people have hope. Espers. People who can subdue ghosts and fight them with other ghosts. Something like Pokemon. And you're an Esper. Although right now you're at an Esper school. All Espers must be in such schools, and then at universities, in order to get permission to use ghosts from the Ghost Control Bureau. Otherwise it's illegal.

Anyway, why is everyone looking at you so strangely? The teacher spoke first.

"I asked a question. Will you be silent for a long time?"