MTL - One Piece: Wudang Baiye, Deputy Captain of the Straw Hats - Chapter 22

Waking up, Kim Hajin finds himself in a familiar world but an unfamiliar body.

It all started when a minute before we began morning activities, something suddenly occurred. The floor started shining a dazzling light, the shining expanded in an instant, and 30 classmates, including me, were laying on top of a place we didn’t recognize.

Mortimer Zhu is an extremely unfortunate high school student who accidentally enrolls into an academy of a dubious nature, where it is the norm to jump in front of moving trains, get dismembered during orientation, and crushed by vindictive bouncing classrooms. Can he stay alive or will he die from the rigors of school? Why have evil spirits suddenly acquired a taste for his flesh?

- Description from Novelupdates