She is a sweet-hearted girl who has a Sacred Gear and Twilight Healing. In her first appearance she was a young nun that Issei met in the city who, after an incident, was expelled from the church and was under the command of one of the Fallen Angels. When Issei saved her, after being reincarnated she fell in love with him, and finally, with the interventions of Rias, her leader, she moved to live in Issei's home.