Yoji, a black-haired youth with rosy cheeks, navigates life in a near-future town alongside his foster sibling Kei and guardian Anna, safeguarding the community under a secret superhero identity. Armed with custom-built, fastening-focused technology, he partners with Kei and their robotic bear ally Oscar to neutralize threats endangering the town’s stability.

His journey spans escalating conflicts, including rivalries with a similarly equipped third hero, thwarting disasters like a rogue birthday airship crisis, and forging alliances with newcomers such as Samhen and the robot Jack. Each challenge tests his ingenuity and resolve, intertwining personal milestones with tactical missions.

Rooted in a unconventional family dynamic, Yoji’s story emphasizes collective resilience and inventive problem-solving. As dangers intensify, he upgrades his gear and strengthens partnerships with a growing network of allies, ensuring the town’s safety through evolving collaboration and adaptable strategies.