Joutarou Aragaki, known as Samurai in the gymnastics world, faces a career setback after a tragic loss and a shoulder injury. Despite his stagnant progress, he perseveres on the Japanese team. Advised to retire, Joutarou plans to break the news to his spirited daughter, Rei, at Ego Wonderland. Unexpectedly, a ninja enthusiast named Leonardo disrupts their plans. Inspired by Leonardo's admiration for his skills, Joutarou decides to defy expectations and stage a comeback, embarking on a journey to reaffirm his place in the gymnastics realm.