The artist's pixiv nickname has been changed to "1", but it was originally "15".
Artist name: 1
Old name: 15
Pixiv username: 1_0219
https://www.pixiv.net/users/23541
https://www.pixiv.net/stacc/ichigo0219
https://sketch.pixiv.net/@ichigo0219
https://twitter.com/1_0219
https://twitter.com/01_0219
https://twitter.com/intent/user?user_id=752938386
https://twitter.com/intent/user?user_id=2288184146
http://theinterviews.jp/1_0219
http://p.twipple.jp/user/1_0219
http://twitpic.com/photos/1_0219
