At the age of six, Shota was placed by his father, Akira, in the care of a mother and her child. He begins to live with Yui, who is close to his age, and her mother, Ryoko. Time goes by, and Shota and Yui become high school students. Since then, Matsuta's parents have never visited them. Yui and Matsuta are attracted to each other, but a phone call from Matsuta's real mother, Nana, makes his feelings unreachable, and Matsuta leaves home... A story of a boy abandoned by his parents and a girl waiting for such a boy. A story of a boy abandoned by his parents and a girl waiting for him, and the kind strangers around them.
Random street attacks have been occurring in a local industrial city. No similarities among the victims, no clues for a motive or the culprit's next move except for sightings of a large figure in a raincoat. On her way home, Nami encounters an attack in progess. She sees the killer eye to eye and is attacked. Tsukishima saves her in a nick of time which brings them closer. In the same city, Detective Shintaro Matsuyama is after the killer responsible for the attacks. He sees a similarity to an unsolved street attack in which his daughter was killer 15 years ago. The city becomes depressed as people are afraid of the attacks and those who try to bring justice. Nami's life grows gloomy along with her symptoms of PTSD, despite falling for Tsukishima. Then she discovers his past. Shintaro becomes emotional with revenge and begins to derail from his police work. The killer is on the loose again.
