Like most women of the same age, Risako (Shibasaki Yuki) is a very ordinary housewife. Her life is almost filled with her husband Yoichiro (Tanabe Seiichi) and her daughter Fumika (Matsumoto Shoka). Recently, Fumika seems to have reached a rebellious period, and she always loses her temper unexpectedly, which makes Risako feel very headache. Although her maternal instinct suppresses her emotions, she still loses control occasionally. One day, Risako received a notice that she was selected as a candidate for the National Senate and needed to attend the trial every day. Although Risako was reluctant, she could not shirk her national obligations. The defendant is a woman named Ando Mizuho (Ito Ayumu), who was accused of killing her own child. "What kind of woman would kill her own flesh and blood?" With such questions in mind, Risako, who is also a mother, began to explore Mizuho's heart step by step.