Married for seven years, Keiichiro has no children and is constantly at odds with his wife, Maria, due to his busy schedule. One day, Maria suddenly runs away from home. Worried about Maria, Keiichiro visits his mother-in-law, Ririko, but... When Keiichiro asks Ririko, she can't find out where Maria is, and he blames himself for not paying more attention to her. Seeing her stepson like that, Ririko can no longer turn a blind eye to the fact that her daughter is tormenting Keiichiro.