Miyamoto Haru works as a mechanic at an automobile repair shop. He married his wife Kanako, a librarian, after dating for a year. In their fourth year of marriage, they have no children, but everything seems to be going smoothly.

One day, Kanako suffers from a subarachnoid hemorrhage. She successfully undergoes surgery, but she loses only her memories with Haru. Reeling from shock, Haru becomes aware again of just how important Kanako is to him, and he resolves to fall in love all over again with her and try to rebuild their relationship from scratch. However, the challenge is whether he can reach her heart once again.