Keizo Jingu (神宮 敬蔵 Jingū Keizō) is JK's father who currently works as a fisherman, but he was once a popular musician and inspired JK to want to be a rock singer despite his own lack of talent. His leaving of this life behind prompted JK and Goto to follow their dreams of forming a rock band together, referring to him as a loser who gave up on his dreams (夢をあきらめた負け犬 yume o akirameta makeinu). He teaches Gentaro how to play the song he used to play to his son, which enables Gentaro to not only regain JK's friendship and snap him out of his delusions, but also indirectly leading Gentaro to beat the Capricorn Zodiarts. At the end of the episode, he and JK talk to each other through their cellphones, having a heart to heart chat.