Koha Ginjiro
English name: Trusty Ginjiro
Genres: Action, Drama
Type: OVA, Episodes: 3
Aired: May 22, 1991 to Nov 20, 1991
Studio: animate Film, Visual 80
Source: Unknown
Rating: PG-13 - Teens 13 or older
Synopsis:
After the death of his elder brother, Ginjiro Yamazaki appoints himself his parents' protector. After transferring to a new school, he gets into a lot of fights.

(Source: The Anime Encyclopedia)