On the night of Mikihiko's 18th birthday, Mikihiko thinks of childhood friend Morio. Morio has been in vegetative state since the age of 6 after being involved in an accident.One day, Moria awakens from his vegetative state. Morio still has the mind of a 6-year-old.

A recently widowed writer whose wife died in a bus crash comes to terms with his grief—or lack of it—in caring for the children of a working man who also lost his wife in the same accident.