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)

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)

At the end of Ring ni Kakero 1, Ryuuji Takane went up against Superstar Jun Kenzaki for the World Title. Now, 17 years later, Rindo Kenzaki, the son of Jun Kenzaki and nephew of Ryuuji Takane, lives with Ishimatsu Katori, the "Kenka Champion" from Ryuuji and Jun's time. Rindo will meet up with a new generation of boxers to create a new Golden Japan Jr. to take on the world. 
(Source: Anime News Network)

Futaba Shinatora