Sensei no yasashi koroshi kata summary: After school, I have private tutoring classes with my "kind" teacher. Because of that, my classmates suspect that my teacher and I are in a forbidden relationship. While there may be some truth to it, it’s a far cry from the “lovey-dovey relationship” that one might expect. My teacher is a serial killer, and I'm his disciple in the art of murder. "Sensei, I learned a lot today." Once again, a bell quietly echoes at the crime scene, heralding the end of today's supplementary lesson. This is the story of a twisted romance between a teacher with a penchant for killing and a student hell-bent on revenge. Alice's parents were killed when she was young. She saw the killer and made the promise to herself to kill him. Little did she know that when she would go to high school, the killer would become her teacher.