Killniru: Is Sensei Really a Contract Killer?

Hittoman Girls' High School is a top-secret assassin training institute located on a remote island in the middle of the ocean. The legendary assassin Takeishi, known and admired by all assassins, is invited to teach there, but Takeishi's true identity is really just that of an ordinary person. A comedy about a fake assassin teacher who will be finished if he is found out.