Soichi Masui
- Born
- 29 March 1966 (60 years)
- Place of birth
- Urawa, Saitama, Japan
- Gender
- Male
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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