Shunichi Domoto, a talented athlete without a true passion, stumbles upon the world of competitive yo-yo. When his friend loses a yo-yo battle to the school bully, Shunichi steps in to help, leading to an unexpected victory. This triumph fuels his confidence, believing he can conquer any challenge effortlessly. However, a defeat against the skilled yo-yo player Seito Hojoin shatters his overconfidence, pushing him to aim for victory over Seito in the national Yo-yo Championship.