URLs

• https://www.pixiv.net/users/27600
• https://www.pixiv.net/stacc/1972
• https://twitter.com/kaidaikaizyu
• https://twitter.com/intent/user?user_id=67610998
• https://sketch.pixiv.net/@1972
• https://www.facebook.com/profile.php?id=100002073229388
• https://www.facebook.com/yuji.kaida.3
• http://www.amazon.co.jp/開田-裕治/e/B004L5DOXA/
• https://ja.wikipedia.org/wiki/開田裕治
• http://home.att.ne.jp/green/kaida/