Souichi Masui (増井 壮一, Masui Sōichi, born 1966) is a Japanese anime director and storyboard artist from Urawa City, Saitama Prefecture (currently Saitama City). He sometimes works under the pseudonym Kazuma Mizukusa (水草一馬).
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Soichi Masui is a veteran Japanese anime director and storyboard artist from Saitama Prefecture known for his extensive work in television and feature film animation.
He is primarily known for directing the Rascal Does Not Dream film series and multiple entries in the Crayon Shin-chan movie franchise.
His notable television and film credits include Akiba Maid War, RahXephon, and the Rascal Does Not Dream series. Full filmography on Mood.
