Artist.
Japanese name: フームーン (the artist uses this spelling: "HuuMoon")
See also
- Niconico account: http://www.nicovideo.jp/user/8389076
- Niconico Seiga: http://seiga.nicovideo.jp/user/illust/8389076?target=illust_all
- Pixiv account: http://www.pixiv.net/member.php?id=2082215