Season 0 of Hero premiered on July 3, 2006.

Five years after leaving Josai bureau, Kuryu Kohei, who has been working in Sapporo, Hokkaido, is transferred to Nijigaura, Yamaguchi (a fictitious town, its real name is Nijigahama), a quiet place on the seaside where he arrives precisely when the first murder in eleven years has been committed. Soon, Takita Akihiko, the most beloved and influent person of the town, is suspected and Kuryu has to deal with this problem, as the other members are too frightened to take any action.

Season 1 of Hero premiered on January 8, 2001.

Kuryu Kohei is a young prosecutor who gets transferred to a division in Tokyo from Aomori. Unlike a typical prosecutor, he takes his cases seriously in a non-serious way. Together with his paralegal, Amamiya Maiko, they crack cases with his unconventional ways. Although earning a reputation as a bad apple, the influence from Kuryu's strong pursuit of justice slowly begins to change things around him.

Season 2 of Hero premiered on July 14, 2014.

Kuryu Kohei returns to Tokyo Prosecutor's Office once again. There are familiar faces, but also new faces who will be working with him this time round. One of them is paralegal, Asagi Chika, who is now in charge of going along with Kuryu's whims.