Misono Emiri

Emiri is a third-year student who also lives with the protagonist as his maid. He often feels nostalgic while looking at her, but due to his amnesia, can't remember what she is to him. Aside from his sexual needs, she takes care of everything in the protagonist's house. A kind girl who always looks a bit sad, she was once trained and became someone's mistress, before being "delivered" back to the Academy (due to being sexually frigid).