Misako, who helps out at the Hirai household, is repeatedly sexually harassed by Hideo, the head of the Hirai household, and his eldest son, Ichiro. She tells herself that it is her way of making amends for her son, whom she placed in an institution for financial reasons decades ago, and does not reject their misdeeds. However, only Akira, the second son, encourages Misako with a smile, and she is saved by his kindness... One day, Misako discovers something hanging on Akira's chest. It is a charm that Misako had given to her son when they were separated, to show the bond between mother and son...