Machiko Kosaka (played by Marie Iri) lives with her husband Ryohei Kosaka in a detached house. She becomes a good wife to support her husband's career. She starts working again and is alienated by her female colleagues at her part-time job, but she gets support from her junior Otsuka. Her work and family life seem to be going smoothly, but strange things start to happen around Machiko: a woman of unknown origin suddenly breaks into her house, and her husband smells the same as this woman... Machiko suspects Ryohei is cheating on her, but she develops feelings for her junior Otsuka during their time together, and the couple begins their own extramarital affairs.