He was one of the prisoners in the sixth dormitory. He went to the Juvenile detention center due to his parents who kept getting complaints about him peering into the girls bath. He came to see the match between Joe and Jose Mendoza.

Joe Yabuki is a troubled young man who runs away from an orphanage. Wandering through the Tokyo slums, he meets former boxing trainer Danpei. Joe is later arrested and goes to a temporary jail where he fights Nishi, his future best friend, ​and leader of a group of hooligans. He and Nishi then go to a juvenile prison miles away from Tokyo. There Joe meets Rikiishi, a former boxing prodigy, and a rivalry develops between them. They face each other in a match in which Rikiishi dominates Joe until the latter hits him with a cross-counter, resulting in both being knocked out. This inspires the other prison inmates to take up boxing. Joe and Rikiishi vow to fight again. 
(Source: Wikipedia)

Yabuki Joe is left downhearted and hopeless after a certain tragic event. In attempt to put the past behind him, Joe leaves the gym behind and begins wandering. On his travels he comes across the likes of Wolf Kanagushi and Goromaki Gondo, men who unintentionally fan the dying embers inside him, leading him to putting his wanderings to an end. His return home puts Joe back on the path to boxing, but unknown to himself and his trainer, he now suffers deep-set issues holding him back from fighting. In attempt to quell those issues, Carlos Rivera, a world renowned boxer is invited from Venezuela to help Joe recover.


**Birth Name:** Nagatoshi Niwa (丹羽長淑)

Joe, a teenage orphan in the slums of the Doya streets, meets Danpei, a homeless, alcoholic ex-boxing coach. Danpei, seeing Joe's boxing talent, decides to train him. When Joe is sent to a terrible juvenile home for petty crimes, he meets Rikiishi who becomes his boxing rival. Danpei arrives at the home to help Joe to train in order to defeat Rikiishi. When Joe decides to seriously pursue boxing, Danpei cannot get a coaching license because of his reputation as a drunk. 
(Source: AnimeNfo)

[Website](http://pro-baobab.jp/men/shiroyama_k/index.html)

He is an actor and voice actor. During his voice acting career he has done a lot of dubbing for a lot of shows and movies, one of the first anime's that he started his anime voice acting career in was the 1966 anime [Osumatsu-kun](https://anilist.co/anime/9884/Osomatsukun/)

A summary movie of the first season for people to get reminded on what happened before the airing of the second season.

Pilot films for Ashita no Joe, released as bonus material on the series' DVD box. 
 
- Aoyama-hen (prod. 1969/11/06) 
- Rikiishi-hen (prod. 1969/12/22)

Gaikotsu