In the world of Ganbare!! Tabuchi-kun!!, the Seibu Lions baseball team advances in a tournament, propelled by the exceptional skills of their star player, Tabuchi. However, as they face the challenges of the next stage, teamwork and determination become crucial. Amidst a blend of real players and animated characters, the team, symbolized by the matured Kimba the White Lion, struggles due to Tabuchi's declining health reflected by his fading shadow. Rallying around him, his teammates, led by Dokaben, gather to uplift Tabuchi's spirits. Despite their sincere efforts with a Tabuchi Day celebration to boost his morale, the event falls short. It is only when Miyoko, a girl who transforms into a cheerleader, enters his life that Tabuchi finds the strength to overcome his despondency.