Masaaki Yuasa is a Japanese director, screenwriter, and animator affiliated with Science SARU, a Japanese animation studio which he co-founded with producer Eunyoung Choi in 2013. Yuasa previously served as president of Science SARU, but stepped down from this role in 2020. Recognized for his idiosyncratic art style and directorial voice, Yuasa began his career as an animator on the landmark television series Chibi Maruko-chan (1990–1992) and Crayon Shin-chan (1992–present), before moving into directing with the feature film Mind Game (2004) and developing a cult appeal following.

Chibi Maruko-chan is a manga series written and illustrated by Momoko Sakura. The series depicts the simple, everyday life of Momoko Sakura, a young girl everyone calls Maruko, and her family in suburban Japan in the year 1974. Maruko is a troublemaker, and every episode recounts Maruko's trouble and how she and her friends succeed in solving the situation. The series is set in the former of Irie District (入江町), Shimizu, now part of Shizuoka City, birthplace of its author.