Apparently character art for a webnovel 魔王とアン　-まったりゆったり世界征服-

CodeKyuubi said:

Apparently character art for a webnovel 魔王とアン　-まったりゆったり世界征服-

魔王とアン　-まったりゆったり世界征服-
->
Maou to An -Mattari yuttari Sekaiseifuku-
->
The Demonlord and An -Comfortable, Laid-back World Domination-

Link: http://ncode.syosetu.com/n2532de/

Edit: Scanned through the prologue, and the character here introduces herself as アノニマス (anonymous), which the author then converts to 名無し (nameless). The Demonlord decides to take the start of anonymous and call her An.