Yamazaki Risako lives with her husband Yoichiro and 3-year-old daughter Fumika. One day, she receives a notification from the court that she has been selected as an alternate member of the jury for a shocking criminal case. The defendant in the case is Ando Mizuho, a full-time housewife who is the same age as Risako. She is on trial for causing the death of her 8-month-old daughter by dropping her into the bathtub. As a mother herself, Risako feels repulsed that Mizuho killed her own child. However, after the trial opens, Mizuho’s circumstances remind Risako of her own past and she soon becomes confused with the chaotic feelings that have lain dormant in her.