While watching a childrens' sumo match, with Daigo helping one of the participants despite his loss, Utsusemimaru remembers his past in a similar situation, all while keeping up his tough act. Soon after, the Kyoryugers are alerted to Daigo's young friend Tsuyoshi being kidnapped by a Debo Monster from Utusemimaru's time. As the other Kyoryugers deal with the Zorima, Kyoryu Gold makes his way to Debo Tangosekku before Kyoryu Red joins him, with the two Kyoryugers brought to a hidden village. Finding himself attacked by Debo Tangosekku and the children he turned into berserkers, and with his Zyudenchi powerless, Daigo is nearly killed by Dogold until Utsusemimaru arrives and covers his escape. Tending to Daigo's wounds, and revealing his resemblance to his old comrade M?shinosuke, Utsusemimaru explains that killing Debo Tangosekku is the only way to restore the children to normal before he gives Daigo a drug to place him into a deep sleep so he can deal with the Debo Monster personally. However, using his Gaburivolver to keep himself awake, Daigo arrives to Utsusemimaru's aid and helps break Debo Tangosekku's spell. After bringing Utsusemimaru to his senses, Daigo finally wins his friendship as they defeat Debo Tangosekku's personal Zorima before Gabutyra arrives as the result of the combined Brave of the other Kyoryugers and Torin so the village can be negated. As Torin looks after the boys, the assembled Kyoryugers defeat the Zorima before taking out Debo Tangosekku with a Kentrospiker/Lightning Afterglow combo. Enlarged, Debo Tangosekku uses his red mist to overpower Kyoryuzin until Pteragordon arrives and combines with Kyoryuzin to form Raiden Kyoryuzin, finally destroying the Debo Monster. Later, the Kyoryugers start to regret what has happened when Utusemimaru starts acting like his usual self rather than the changed man that opened up to them.