Ayano is the former secretary of the third-generation young company president, and is now living as his wife. She has been struggling with infertility for years. Her father-in-law, the second-generation company president Shigeru, desperately wants a grandson and demands his son divorce Ayano. However, the son refuses and tells his father he wishes to continue his married life with Ayano. As a result, Shigeru develops intense hatred toward Ayano and begins cruelly tormenting her as revenge.