Tadaomi Karasuma is a teacher at Assassination Boarding School. A lot of female students and teachers has a crush on him but he saved himself for a certain blonde hair student. Irina Jelavic is a student at Assassination Boarding School. She's known as the school's most beautiful student and she never hands in her homework. Although she's a bad girl, she's one hell of an Assassin Student. No one in the school knows that the hot teacher and hot student are together, and that's what Karasuma and Irina plans on.