Minori learns her husband Yudai has been unfaithful for 15 years with Riko. Enraged, she vows revenge by manipulating Riko's son Wataru to destroy their lives.

Kisaragi Minori, who thought she had a happy family with her pure love since they were students and was married to her husband Yudai, was blessed with children, but the story begins when she finds out that her husband Yudai has been cheating on her for 15 years. Minori, who has vowed to take revenge on Yudai, who has another family, and on his lover, Riko Miyake, plots her revenge using Riko's son, Wataru.—MyDramaList

Minori Kisaragi (Marika Matsumoto) is a housewife and she is married to Yuta Kisaragi (Terunosuke Takezai). She met him when she was a student and fell in love with him at that time. After 10 years they finally married. Now, they have a 5 year old son. When Minori Kisaragi was a child, her mother died and she did not know her father. After her mother's death, her grandfather raised her. She has absolute faith in her husband Yuta Kisaragi, but she learns that her husband has been cheating on her for 15 years. Minori Kisaragi decides to take revenge on him. She approaches high school student Wataru Miyake (Kota Nomura). His mother, Riko Miyake (Maho Nonami), is the woman having an affair with her husband Yuta Kisaragi. Minori Kisaragi attempts to collect evidence of their affair. She soon learns the secret of her own birth and a major conspiracy hidden in her husband's affair.—AsianWiki