Due to an accident, Tsuda Rei has lost all of her memories. She can't remember her favorite foods, her parents, or even her childhood best friend, Ichi. Ichi drags Rei to the place where she lost her memories, but says he won't tell her anything. Then along comes the handsome upperclassman, Kujou Manabu, who tells Rei that is it okay if she doesn't remember anything...