Eriko, who raised her beloved daughter Mahiru single-handedly, finally saw her married and settled into motherhood. It was supposed to be a happy marriage, but soon Mahiru confided in Eriko about Tatsurou's infidelity. When Eriko called him out to hear his side of the story, he suddenly confessed, 'I'm in love with my mother-in-law.' Since that day, Eriko has been subjected to his twisted affections. This can't go on forever, so she tries to reason with Tatsurou...
