Omura Takashi (Hiroshi Tanahashi), the ace wrestler who once shone in the ring, disappeared due to an injury. He has always been passionate about wrestling, so he chose to put on a villain mask and re-enter the arena as the masked "Cockroach Brother". Even if he was fighting with his opponent and being booed and mocked by the audience, he would never leave his favorite wrestling ring. When his son Shota asked him about his career, the masked man "Cockroach Brother" was really embarrassing, until Shota accidentally discovered that his father was actually the villain champion in the wrestling ring! What's worse is that his classmates mistakenly think that Shota's father is the popular wrestling champion Dragon George, and they ask Shota for his father's autograph, which leads to a series of unexpected jokes. At this time, Omura's knee injury relapses, and the doctor warns him not to use his "killer move", but Omura wants to use his perseverance to teach Shota that victory is not the most important thing.