Hanagasumi High School is situated right in the middle of Kabukichō, Tokyo's top red-light district. Due to this location, students are constantly robbed and harassed by yakuza, gangs, and others. To ensure the students' safety, the Student Council devised a single solution: befriend the legendary "Tiji-kun," the strongest man in Kabukichō. Two students, Motobu Tomoko and Akazawa Ryo, were assigned this task. However, when they discover the true identity of the mysterious "Tiji-kun," maintaining a peaceful school life proves harder than it seems.