Takashi Kitadai

Naito Shinjuku family, a hereditary organization that can inherit family heads only Washio's pedigree.Taiga Washio, the eldest son of the president, Taro Washio, is a primary school student, but is a day to receive training for succession in leader assistant Reiji Toki.Meanwhile, Gunji's brother, Kiyoharu Washio who was thought to be dead assassinated Gunji.

Un conserje, que oculta su verdadera identidad como asesino profesional, lucha contra nueve asesinos para salvar a la hija del hombre que lo crió.