After detective Natsumi Yukihira brings an end to the police hospital terrorist case, Natsumi is transferred to the Nishimonbetsu Police Station in Hokkaido. Meanwhile, a series of grotesque murders occurs in downtown Tokyo involving nails placed in the body of the victims. The fingerprint of Natsumi's ex-husband, freelancer journalist Kazuo Sato, is found on the the body of a victim and Kazuo is placed on the most wanted list. Soon after, Kazuo finds Natsumi and hands her a USB memory stick. The device contains information on a secret organization within the police department. Kazuo tells Natsumi that the series of murders are warnings and suspects become the next victims. Natsumi is then arrested as a suspect. Tokyo prosecutor Katsuaki Murakami appears at the Nishimonbetsu Police Station to investigate.

Ueto Aya's is Juri Tatematsu. She's blind like her husband. They give birth to a child, despite fears and opposition from their parents. Raising the child, Juri keeps pushing herself towards her dream of becoming a professional musician. She made her dream come true.

Miu, a second grader, tries to follow her mother Mizuho's advice to be a "proper child" and observe various restrictions. Her piano teacher, Yuko, on the other hand, encourages Miu to express herself freely. Miu eventually comes to desire freedom from restrictions, but she also understands that this would be a betrayal to Mizuho. Miu struggles between her yearning for freedom and her sense of guilt toward her mother. Meanwhile, Mizuho also undergoes a certain change... An awkward father and son search for a form of love.