"My husband has another family!?" Kisaragi Minori (Matsumoto Marika) and Kisaragi Yudai (Takezai Terunosuke) got married out of pure love. They are blessed with children and should be a happy family to anyone who sees them. Feeling something is off about Yudai’s recent behavior, Minori follows him. What catches her eye is the sight of Yudai walking happily with his lover Miyake Riko (Nonami Maho) and her son Miyake Wataru (Nomura Kota). Divorce alone is not enough. The thrilling revenge of a cheated wife begins now!

Minori (Matsumoto Marika) begins working at the cram school attended by Miyake Wataru (Nomura Kota), the son of her affair partner. While concealing her true identity, she closes the gap in order to investigate Wataru's father. Is Wataru's father her husband, Yudai (Takezai Terunosuke)? Wataru slowly opens up to Minori, who kindly gives him advice, and tells him stories of his childhood. As his suspicions deepen, he receives news that his mother, Riko (Nonami Maho), has collapsed. Minori secretly follows Wataru as he heads to the hospital. Yudai arrives late to join Riko and Wataru in their hospital room.

Riko (Nonami Maho), the woman her husband had an affair with, was pregnant with Yudai's (Takezai Terunosuke) child. Wataru (Nomura Kota), who knows nothing about it, tells Minori (Matsumoto Marika) about his mother, Riko. Living with Yudai, who keeps telling her lies, slowly eats away at Minori, but as she consults with her best friend Sara (Ota Rina), the flames of revenge begin to quietly burn. Minori heads to the beauty salon run by Riko. The betrayed wife and her lover finally come face to face. An explosive conversation unfolds...!