The Miura family's first trip together since their divorce was planned by their eldest son, Kenji, as a gift for his mother, Eriko, who was deeply touched by his unexpected thoughtfulness. However, Kenji's true intentions were far from filial. He had long resented the overly affectionate relationship between his younger brother Osamu and their mother, and he saw this trip as the perfect opportunity to execute his secret plan: to steal his mother away for himself. Watching Osamu cling to Eriko as usual, Kenji's jealousy intensified until he was ready to put his scheme into action. What follows is a series of events that threaten to unravel the family's bonds forever.