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Despite being talented in various sports, Shunichi Domoto is not passionate about any of them in particular—that is, until he discovers the world of competitive yo-yo. It all begins when Shunichi's friend, Beso Kimura, loses his yo-yo in a duel against the school bully, Benkei Musashimaru. Albeit inexperienced, Shunichi eventually agrees to help Beso retrieve his yo-yo. After practicing for three days, Shunichi challenges and unexpectedly defeats the relatively skilled Benkei. Shunichi's win instills the belief that the yo-yo is easy to master, and that he is ultimately able to easily master anything he puts his mind to. However, after losing to the exceptionally gifted yo-yo player Seito Hojoin, Shinichi finds his ego shattered. As the humiliating loss ignites a spark in Shunichi, he decides to surpass Seito in Japan's national Yo-yo Championship! Shunichi Domoto is a talented, sportive 5th grade boy who is used to help sport teams in his school. He enters a Yoyo duel against a bully boy called Benkei to help his friend, Beso, to get back his Yoyo which was stolen by the bully. He beat him, but after that, he meets the exceptionally gifted Yoyoer, Seito Hojoin, who beat him while he ridiculed the Yoyo game. So, Shunichi enters Japan's Yoyo championship to get his revenge from his loss with Seito. Throughout this Championship, he learns new Yoyoing Skills and meets powerful rivals.