Yasu shows up as a minor supporting character in Cyborg 009: The Cyborg Soldier. He's basically a troublemaker hanging around Tokyo, and he's oddly proud of the scar on his nose. When Joe Shimamura crosses paths with him, it turns out they were actually friends back when Joe was being raised by a priest. The connection hints at Joe's past life before everything changed.
Content compiled by AnimeList.moe from publicly available sources.
