A collection of short sequences taken from the Ring ni Kakero manga, made during the production of the fifth Saint Seiya movie by the same team, available via a mail order form included with an issue of the Super Jump magazine in 2004. It was included in the Kurumada 30th Anniversary DVD.

Takane Kiku and Takane Ryuji are the children of a legendary world contender boxer. Kiku, the daughter seems to have inherited her father's boxing sense and tries to teach Ryuji to become a world contender. However, Ryuji hates boxing and gets picked on. After Kiku and Ryuji leave their hometown for Tokyo, Ryuji eventually learns to discover a passion for boxing after an encounter with a boxing prodigy, Kenzaki Jun. This will eventually lead him to learn crazy moves and out of this world opponents to become one of Japan's top junior boxers. 
(Source: Anime News Network)

In order to fulfill their dead father's wish, the siblings, Kiku Takane and Ryuuji Takane aim for the champion title of the boxing arena. The sister, Kiku, will act as the trainer while her brother, Ryuuji, will concentrate on the role of the boxer and learn the Boomerang Hook technique. His battle with many rivals has led to the growth and maturity of Ryuuji. The junior high boxing tournament has began and Ryuuji will be fighting his arch-rival, Jun Kenzaki. The battle begins.
 
(Source: Anime News Network)

Immediately after Ryuuji Takane won the Champion Carnival, the U.S. Junior Champion Black Shaft appeared, and challenged the best Japan has to offer, just before the World Tournament is about to happen. Now Ryuuji, Takeshi Kawai, Kazuki Shinatora, Ishimatsu Katori, and Superstar Jun Kenzaki have to prove to not only Black Shaft, but the world, that they are truly world-class boxers before the World Tournament starts. But Shaft is not recruiting boxers for his challenge, but instead gets a life-timer criminal from Death Row, the leader of the Great Angels, one of the toughest gangs in America, a mysterious woman, and the "Dark Emperor of the South". Also, Shaft negotiates with Don Giuliano, the Italian Junior Champion, just in case...
 
(Source: Anime News Network)

After defeating Black Shaft's makeshift Team USA and proving their worth to the Shadow Clan, Team Golden Japan Jr. will finally enter the World Jr. Boxing Tournament. In order to fulfill their goal of a perfect victory they'll have to take on teams from countries like Mexico, Italy, France, Germany, and the mysterious and godlike Team Greece.
 
(Source: Anime News Network)

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