For many years, Osamu Kimura lived with his mother Keiko, but after deciding to marry Kasumi Saito, he invited her to his home and the three of them live together. However, Osamu and Keiko have a secret that they cannot tell anyone. …… Nine-headed Shinmei. Osamu's biological father, Keiko's husband, and a serial rapist sentenced to 20 years in prison. At this time, when Osamu was about to get married, the worst father came back.
