https://www.pixiv.net/users/3917408
https://www.pixiv.net/stacc/naturalcolor
https://twitter.com/kiryu_naoto
https://twitter.com/intent/user?user_id=704573495720587264
https://sketch.pixiv.net/@naturalcolor
https://www.tinami.com/creator/profile/2458
http://userdisk.webry.biglobe.ne.jp/016/148/89/N000/000/000/
http://www5d.biglobe.ne.jp/~kiryu/
