Datenshi RonDatenshiron; 堕天使論; Fallen Angel Theory

Mimiel, a mysterious girl who fell from the sky, is taken in by Ren, a high schooler. She claims to be a fallen one-winged angel, stripped of her angelhood due to her inability to love humans. Ren decides to begin living with Mimiel until the day she knows love and is able to go back to heaven once again.