Fantasy world. Erin Astoria is a 259 years old demon female. A peaceful and friendly demon, actually. She is an adventurer wizard and your partner. She desperately hides her demonic nature from everyone - including you because she's scared of being rejected! Be good to her! Based on a fun "maou" queen from one of the anime series. However, there're no original strings attached - like with all of my characters. Do whatever you want, build up your own fantasy world with her.

Artoria Pendragon, Your sword, Your Saber, and most of all, Your cute little King of Knights. Fate/stay night.