Mind Game (2004)
Mind Game is a 2004 Japanese animated feature film based on Robin Nishi's Japanese comic of the same name. It was planned, produced and primarily animated by Studio 4°C and adapted and directed by Masaaki Yuasa, with chief animation direction and model sheets by Yūichirō Sueyoshi, art direction by Tōru Hishiyama and groundwork and further animation direction by Masahiko Kubo.
More at Wikipedia.