Masaaki Yuasa
is a 2004 Japanese animated experimental feature film based on Robin Nishi's manga of the same name. It was planned, produced and primarily animated by Studio 4°C and adapted and directed by Masaaki Yuasa in his directorial debut, with chief animation direction and model sheets by Yūichirō Sueyoshi, art direction by Tōru Hishiyama and groundwork and further animation direction by Masahiko Kubo.