Revenge. It can drive a person insane, and have them go to great lengths to achieve the revenge they have in mind. For Y/n L/n, whose younger sister unalived herself after being tormented by her many bullies, and never telling anyone about it, Y/n literally abandons his old life, and becomes Yuzuriha, a school nurse. However, he may seem like a cute nurse, but he's now a cold-hearted killer, ready to take lives of anyone who gets in his way, as he breaks not only the students, but the teachers who let this happen.