Seiji is a third generation "Gosei kai" gang member. He works to build up the group's strength. Meanwhile, a journalist investigates a case that occurred 19 years ago. He meets Hayato, Daisuke and Asami.
Hamura entered a high school as a biology teacher. Unexpectedly, one of his students, Mayu, fell in love with him. The forbidden love between the teacher and the student began to sprout. Hamura was worried that his relationship with Mayu would be misunderstood, so he tried to escape. However, he later understood Mayu’s tragic life and that the two could not be separated…
Uchiyama Kaede and Shiina Kasumi used to be best friends. Now in high school, Kasumi grew more popular than Kaede, which has led her to continually bully her ex-best friend. One day after school, Kaede meets Kishida Takumi, a bike thief who's especially talented in picking locks. She asks him for a favour: if he could possibly open the key to the school roof. Meanwhile, the arrival of a new teacher seems to bring changes to the school.
