Artist.
Japanese name: 灰塚ハイジ
The other name: ハイジ (Heidi) or ハイちゃん
Circle name: ぐれいある! (GrayAll!)
https://www.pixiv.net/users/7507419
https://www.pixiv.net/stacc/716016
https://twitter.com/gray_all
https://twitter.com/gray_paro
https://twitter.com/intent/user?user_id=936019734
https://twitter.com/intent/user?user_id=791336862493253632
https://ask.fm/gray_all
http://privatter.net/u/gray_all
http://privatter.net/u/gray_paro
http://odaibako.net/u/gray_all
http://twpf.jp/gray_all
