Artist. Their artstyle is very reminiscent in style to shinoba.
Japanese name: サチス (Sachisu)

See Also:

• Pixiv Account: https://www.pixiv.net/member.php?id=22198273
• Twitter Account: https://twitter.com/sachisudesu
• Facebook Account: https://www.facebook.com/sachisudesu
• Instagram Account: https://www.instagram.com/sachisudesu