Yu's father. He took his sick son, Yu, along with his wife, to the Village of Miracles to be treated by the healer, Toki. However, unbeknownst to him, Toki had been replaced by the mad imposter Amiba. After "Toki" appeared to heal his son, Jun was forced to become a 'test dummy' in return and was about to have his respiratory muscles sealed until Kenshiro arrived in the nick of time. When Kenshiro revealed that "Toki" had in fact euthanized Yu, Jun attacked his son's murderer with a knife, but Amiba struck his Gekishinko vital point which rapidly increased his heart rate until his veins burst.