Ring ni Kakero 1: Shadow-hen is a tV series anime that premiered in spring 2010, produced by Toei Animation.

About the production: the story comes from a manga, there are 6 episodes of about 21 minutes and its current status is "finished".

Its main genres are action and sports, with themes such as Boxing.

On AniList, Ring ni Kakero 1: Shadow-hen has an average score of 65%, a good score, and appears on 764 users' lists.

The franchise continues in or follows from: Ring ni Kakero 1: Nichibei Kessen-hen and Ring ni Kakero 1: Sekai Taikai-hen.

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 assasination technique, kidnaps Kiku in order to lure Ryuuji and the others into a fight to see who's truly the better representatives of Japan's junior boxers. (Source: Anime News Network)

Official synopsis from AniList.