Killniru ~Sensei ga Koroshiya tte Hontou desu ka?~キルニル～先生が殺し屋って本当ですか？～; Killniru: Is Sensei Really a Contract Killer?

The legendary contract killer Takeishi is appointed as a teacher at Hittoman Girls' High School, a contract killer training institute. However... Takeishi's true identity is that of an ordinary person...!?