Aya married a man with a child and started living together as three. Her relationship with her husband's son, Keisuke, wasn't bad, but she couldn't close the distance as his mother. One day, Keisuke came home from school with a serious expression. He then begged Aya, who was worried, 'I want you to teach me how to kiss.' It seems he failed in his relationship with a woman. Ayano, who once refused his request, decided that solving her child's problems is a parent's duty and said, 'Mom will teach you adult kissing,' gently guiding Keisuke...
