Newlywed public housing wife Sumire feels a bit dissatisfied with her busy husband's absence. The building manager's son, Makoto, who lost his mother, has secretly harbored feelings for her. When Sumire discovers Makoto's affection, she allows their relationship to become something intimate. Meanwhile, her husband, due to work circumstances, informs her that his boss will be visiting their home, and proposes a new plan to protect himself—drawing Sumire into a dangerous scheme.