Daigo Daimon first met Naoto at the Tiger's Den, where the two bonded over their shared status as orphans—one of the reasons Daigo became Naoto's closest friend. After suffering defeat at the hands of Tiger Mask, Daigo escaped the Tiger's Den and took on various jobs to survive, all while quietly supporting Naoto in his ongoing battle against the organization.

In episode 72, Daigo returns to the world of professional wrestling under the ring name Mister Fudou.