Seito Hojoin reigns as Japan’s Yoyo Champion, wielding unmatched skill and fierce determination. His journey traces back to a childhood yoyo gifted by his father—a cherished memento that transformed into a poignant symbol after his mother’s death, as she clutched it in her final moments. This tragedy strained familial bonds, fueling his father’s insistence that he abandon yoyoing to master classical piano. Defying expectations, Hojoin chooses to defend his championship title, skipping a critical piano competition to clash at the Japan Champion Carnival, a decision highlighting his struggle between duty and passion.

His rivalry with Shunichi Domoto ignites after defeating the protagonist in their first encounter, spurring Shunichi’s resolve to overtake him. Though fiercely proud, Hojoin displays respect for adversaries, openly acknowledging competitors like Benkei Musashimaru during the carnival, blending icy dominance with unexpected sportsmanship. His layered persona intertwines steely competitiveness with vulnerability, rooted in unresolved family tensions.

While linked to Pro Spinner Kenichi Nakamura’s prototype Hyper Dragon yoyo, Hojoin opts for the high-performance Bandai Hyper Dragon Aqua in matches, reflecting his elite status. The anime anchors his narrative in the relentless pursuit of victory amid external pressures, leaving his future beyond the tournament unexplored. Manga threads hint at enduring rivalry and growth, though specifics remain undisclosed, preserving focus on his present battles and unyielding drive to remain champion.