akimaru_(tetralemma)
Artist.
Japanese name: アキマル or あきまる (Akimaru)
Circle name: tetralemma
See also
* Pixiv account: http://www.pixiv.net/member.php?id=2990675
* Twitter account: http://twitter.com/akimaru_bd
* Comike Web Catalog: http://webcatalog.circle.ms/Perma/Circle/10336750