Shota Igarashi is on the run from the police after committing a crime. He sneaks into a home. An elderly lady Tae Yamamura approaches Shota and mistakes him for her grandchild. Shota begins to live with Tae. A couple days later, Tae's real grandchild Kaori Miyake arrives. Shota and Kaori face each other. One night, Shota and Kaori listens to the radio and hears a discussion about an old marathon runner. Kaori encourages Shota to participate in a marathon.