Artist, mangaka. Particularly notable for navels.
Japanese name: 広川 浩一郎 (Hirokawa Kouichirou)
Circle name: OVACAS
Site name: ヒロカワ超特急
https://www.pixiv.net/users/58591
https://www.pixiv.net/stacc/hirokawa1911
https://twitter.com/hirokawa27
https://twitter.com/intent/user?user_id=785400858
https://sketch.pixiv.net/@hirokawa1911
http://doujinshi.mugimugi.org/browse/author/285/
http://doujinshi.mugimugi.org/browse/circle/1479/
http://hirokawa.sakura.ne.jp/sblo_files/hirokawa-ova/image/
http://karin.sakura.ne.jp/~hirokawa/
http://twitpic.com/photos/hirokawa27