Natsuko is a single mother raising her son, Noboru. Overworked at her relative Ohsawa's company, the only one who has supported her is a visiting contractor named Hanagaoka. One day, during a break at work, Natsuko meets Hanagaoka when suddenly her son calls her, and she answers the phone in front of him. It's then she realizes today is her birthday. Noboru promises to celebrate together in a week, but this time Ohsawa holds her back, leaving her unable to fulfill yet another wish. Her life continues to waver between family, work, and the unexpected complications of romance.