Yasuo is an anime original character. 

Yasuo appears in episode 69 of Ashita no Joe. 

Yasuo wanted to pursue a career in boxing so he moved away from his mother and sister's farm life to a bigger city. His boxing career wasn't going that good and he was running low on cash, so he decided to rob his mother and sisters savings. He wore a mask to protect his face so they wouldn't recognize him but after Joe stops him by repeatedly punching him the mother tells Joe to stop since she recognizes Yasuo. 

She then asks Yasuo ''what son robs their own mother'' and tells Yasuo that if he was low on money he should've just asked and gives him the savings. Yasuo then walks away slowly with the money but then turns around and starts crying and runs to hug his mother.

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. <br><br>
(Source: AnimeNfo)

Kazuya Tatekabe was a Japanese actor and voice actor.