Shizuka's son, Shinichi, has an uncontrollable sexual desire and is always masturbating. His room is littered with AVs and masturbation toys, and he indulges in masturbation whenever he has free time. Shizuka's neighbor , Kohana Non Obana, also has a strong sexual desire, but her strong sexual desire caused her to be dumped by her sex friend. When she tried to have phone sex with him, she was rejected, so her sexual desire was so strong that she just masturbated. By a strange coincidence, the strongest spear and shield are attracted to each other and end up next to each other.