When 28-year-old Yukihira Asuka attended her high school reunion, she reunited with her former classmate Mizuno Haruto.After the two learned that they had a crush on each other at the time, they decided to start dating 12 years later. However, one day Haruto encountered an unexpected tragedy and fell into a coma and became seriously ill.Asuka stayed with him who hadn't woken up, thinking of the forgotten past times between Haruto and his classmates...