Artist.
筋肉先生 is his pseudonym in the image board [ふたば☆ちゃんねる (虹裏img )]. (Copyright tag: futaba_channel)
Japanese name: 友美イチロウ, 筋肉先生, ぶんちん
Circle (友美イチロウ): A-office
Circle (筋肉先生): スエヒロガリ
https://twitter.com/kin29t
https://twitter.com/intent/user?user_id=57041484
http://mini2mitan.blog.fc2.com
http://doujinshi.mugimugi.org/browse/author/5653/Yumi-Ichirou/
http://p.twipple.jp/user/kin29t
http://twitpic.com/photos/kin29t
