Rin

"Ouroboros" is an ancient symbol that depicts a snake eating its own tail - meaning infinity. Based on a popular comic, a clumsy detective and a cool gang stand up to true evil. Ikuo and Tatsuya grew up in a children's orphanage together. When their favorite teacher, Yuiko, is murdered, a policeman wearing a gold watch covers up the incident. Ikuo and Tatsuya promise each other to avenge their teacher someday. Twenty years later, Ikuo is a detective in Shinjuku second police station investigating various cases with elite detective - Mizuki, while smart and handsome Tatsuya has become one of the top members of a gang group.

Mia Kurihara works in the public relations department of a company. She falls in love with Kairi Miyoshi. He is the vice president of the company, but he is also married.

Sakurai Taro’s parents died young. His grandmother, Akiko, has been making great effort to protect her struggling candy store, Sakuraya, in the old part of Tokyo, but it's not easy. Taro eats candy with regular customers such as chilhood friend Saegusa Hiroki who aspires to be a scriptwriter, and talk nonsense, like in their youth. However, they realize this unfettered, comfortable existence will end some day with the passage of time. Then Taro’s ex-classmate, Kimura Reiko, comes back home with her son after a divorce. He and his friends start to notice what is truly important to them as they face up to their pasts, dreams and pains.