Yukari Aoyama, the second wife of the Aoyama family, who lives with her husband's two stepchildren. Her husband, Seiichi, was a working man and tended to be away, but managed to raise his children alone. Now that my sons have grown up, Yukari has a certain worry. "My second son, Tatsuya, doesn't know that I'm not his real mother..." One day, Yukari's worries become a reality. I was eavesdropping on my conversation with my husband. What is the fate of a family whose trust between mother and son has completely collapsed? ?