The series follows Makio Sakaki, a 27-year-old aiming to become his father's successor. To prove his worth, he must pass high school and overcome various challenges including friendship, righteousness, and potential love.
Gokusen is the story of Kumiko Yamaguchi, aka. Yankumi, a fourth generation crime syndicate member. She's gone straight and wants to be a teacher though, but she's one you don't want to mess with.
Tatsu (Hiroshi Tamaki) is 38 years old. He was once a legendary yakuza and was known as "Immortal Dragon" because he was so feared. He quit the yakuza and married Miku. Tatsu then became a househusband. He buries himself in housework.