Satomi Ohshima

Aoi and Riku, who have been friends since they were five years old, are part of a band with other students at their university. Riku is known as being unflappable and "perfect". After a misfired performance on Aoi's birthday she has a tragic accident. She awakens to find herself re-living the past week. Riku reveals that he can turn back time, allowing him to perfect his apparent abilities.

The story of a 15-year-old high school student, Ikeuchi Aya, who soon discovers she has an incurable disease that affects the cerebellum of the brain. Aya lived her life to the fullest until her death at 25.