Ring ni Kakero 1: Kage Dou-hen
Japanese title: リングにかけろ1 影道編
Type: TV
Episodes: 6
Premiered: spring 2010
Source: Manga
Genres: Sports
Studios: Toei Animation
Duration: 24 min per ep
Rating: PG-13 - Teens 13 or older

After defeating Black Shaft's makeshift Team America, the Golden Japan Jr. team returns to training for the World Tournament that will be held in Tokyo. But during training the Shadow Clan, which uses boxing as an assassination technique, kidnaps Kiku in order to lure Ryuji and the others into a fight to see who's truly the better representatives of Japan's junior boxers.

(Source: ANN)