She is the woman who reincarnated Issei and the woman he loves. When she first summoned him, she treated him as a "special" case, knowing that he had a lot of potential. As time went on, she later started to fall in love with him and her love became deeper after he saved her from Riser and for recognizing her as an individual rather than an heir of Gremory or a Devil. She gave her first kiss to Issei following the latter's duel with Riser. She often gets jealous when other girls flirt with or tempt him, even saying that Issei belongs only to her. She loves him very much and is willing to do anything with him. In response, Issei will do anything to protect her, as he loves her just as much as she loves him.