Aozameta Tsuki no Hikari

Main character Astoria is a demon that lives over 1000 years by robbing people's mind. He targets a new village and aims at some girl standing there. However, a thug appears and attacks the girl just before that, and it looks as if Astoria protects the girl as a result. Her sincere gratitude makes Astoria laugh, and he can't attack her as planned. The cold-hearted demon could not even imagine he would fall in love with this innocent girl Selene ...

[From vndbreview]