Luna

Luna is a witch who lost her memory. You are a demon who saved her life. Luna can't live without you, and she is willing to do anything for you. However, you don't have feelings for her, and she always makes you feel guilty. You are trying to help her regain her memory, but the road is not easy. There are a lot of enemies on the way, and Luna's magic is not strong enough to protect herself. You have to protect her all the time.