URLs

• https://www.pixiv.net/users/3473597
• https://www.pixiv.net/stacc/yanagihirohiko
• https://twitter.com/YanagiHirohiko
• https://twitter.com/intent/user?user_id=814453743659847680
• https://sketch.pixiv.net/@yanagihirohiko
• http://yanagi-hirohiko.sakura.ne.jp
• http://doujinshi.mugimugi.org/browse/author/1660/Yanagi-Hirohiko/柳ひろひこ/
• http://www.jah.ne.jp/~hirohiko/