Kenjirô Yamashita

Bakery employee Ichii Fumi holds a peculiar outlook on marriage: "I doubt anyone would love me forever, and I'm doubtful I can love someone forever." One day, Fumi meets the focus of her very first crush, Yuasa Tamotsu. Over time, the distance between Fumi, who broke up with her boyfriend for being unable to reach a decision about marriage, and Tamotsu, who still pines for the wife he divorced, begins to grow closer.

Seiichi is the owner of a flower shop. He enjoys his peaceful single life. Kiho runs the ramen restaurant left to her by her father, but she's thinking of closing it.

Interior designer Mako is unable to forget her first love from childhood, who helped her when she was bullied back in elementary school days. One day, a letter arrives from someone named Kosuke—the same name as the boy Mako can't forget. It says, "Do you remember me? Please contact me, because I want to see you after all this time." It's been 22 years since she last saw her friend, but Mako is excited to see him again. But the "Kosuke" who shows up to meet her is far from the man she imagined.

The story tells what happened at the Oya Institute after the fight in the containers of the High and Low movie. Fujio and Tsukasa were students from Oya High School, but Fujio had to move to a school in the countryside where his grandfather lives to take care of him. While in the institute new students will try to take control.