A high school girl gets secret tutoring lessons on how to kill by her own classroom teacher in this dramatic manga. After school, Sensei tutors me in secret. My classmates think we have some sort of relationship, but they've got it all wrong. Sensei is a serial killer, and I am his apprentice. "Sensei, please teach me how to murder." A dark love unfolds between a serial killer Sensei and his devoted apprentice!