Tatsuhiko Naitou

Tatsuhiko Naitou (内藤 達彦, Naitō Tatsuhiko) is Yoshifumi Nitta's former mentor in the yakuza organization and the estranged father of Hitoshi who spent several years in prison and he is released in the months after Nitta starts taking care of Hina.

Personality
Tatsuhiko is known to be a quick-tempered, demanding and violent man.

Etymology

 * The name Tatsuhiko means "accomplished, reach, arrive, attain" (達) (tatsu) and "boy, prince" (彦) (hiko).
 * Tatsuhiko's surname Naitou means "inside, within" (内) (nai) and "wisteria" (藤) (tou).

Trivia

 * Tatsuhiko gave Yoshifumi Nitta the scar above his eye.