Minoru Tatsukawa

Along with Tetsu, Minoru is a member of Kumiko's Yakuza group, and is one of her loyal followers. He and Tetsu watch over Kumiko and worry about her. Minoru and Tetsu can occasionally be seen running a takoyaki stand near Kumiko's school where they can be near her if needed. Sometimes their enthusiasm in serving her almost betrays her secret, but all they want to do is help. Kumiko took him in when he was a teen, calling him a "younger brother" since the family didn't accept underage kids, and he had no where else to go.

(Source: Wikipedia)