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://x.com/hirokawa27
https://x.com/i/user/785400858
https://sketch.pixiv.net/@hirokawa1911
http://hirokawa-ova.sblo.jp
http://hirokawa.sakura.ne.jp/sblo_files/hirokawa-ova/image
http://karin.sakura.ne.jp/~hirokawa
http://doujinshi.mugimugi.org/browse/author/285
http://doujinshi.mugimugi.org/browse/circle/1479
http://twitpic.com/photos/hirokawa27
