Chibi Maruko-chan
Yuasa earned his first significant credits as a key animator in 1990 on the landmark television series "Chibi Maruko-chan" (1990-92), which Ajia-do worked on as a subcontractor studio. Based on a popular manga, "Chibi Maruko-chan" was a major hit and provided opportunities for Yuasa to refine his skills. His next breakthrough came with the film "Chibi Maruko-chan: My Favorite Song" (1992), on which he was entrusted with two musical sequences. Yuasa storyboarded the sequences, the first time he'd taken on this responsibility, and was able to animate them in his own characteristic style; he later identified these segments as the first time that appreciation of his work by fellow artists led him to view his own work as good.