"Eiji"
Genres: Comedy, Drama, Sports
Type: Movie, Episodes: 1
Aired: Aug 25, 1990
Studio: Production I.G, animate Film
Source: Manga
Rating: R - 17+ (violence & profanity)
Synopsis:
Legendary boxer Keijiro Akagi's second son, Eiji, is a high school dropout and the world's worst rock guitarist. Though his father and elder brother are both boxers, he hates the sport but suddenly takes an interest in it when he meets the local champion's little sister. 

(Source: ANN)