Naoko Tanaka is a 26-year-old office lady (OL). Her job is typical, but her workplace has fierce fights among different cliques. Other OLs are absorbed in the daily clique fighting. One day, due to an OL at the company, Naoko Tanaka's company is targeted by OL from all over Japan.
Isao Komori is a college dropout who spends his days cooped up in his apartment playing video games. The highlight of his day is visiting a convenience store where an angel-like high-school girl called Mari visits every night. One morning Komori wakes up in Mari's body. Another "Komori" inhabits his old body, and Mari has disappeared. Komori struggles to maintain Mari's ordinary life and starts to investigate Mari's disappearance.
The series follows Koichi Numakura, a young man seeking revenge against the yakuza, who took his mother from him. Inspired by the protagonist of Fist of the North Star, he dedicates himself to learning the fictional martial art of Hokuto Shinken. Along the way he learns that, while he can't actually kill people, he does have all the qualifications to become a top-tier masseur.
