Seventeen-year-old Yumi Eguchi's mother died in a car accident on a rainy night. The police investigation was proceeding step by step, and it seemed to be just an ordinary traffic accident. But a retired detective came to her door and asked her if she had heard of Ayano Matsuda, a young woman who was murdered five years ago in an unsolved case.
Yumi has no mobile phone and no money, so she supports herself by working in a repair shop. Her mother drank heavily and beat her during her lifetime, but she is dead and life must go on. She cooperated with the police investigation, responded to the concerns of her classmates and neighbors, and her days moved forward in peace.
But the retired policeman seemed to believe that she was related to the old case and appeared next to her again and again. At the same time, more details of old cases were dug up, and a serial killer codenamed "B" gradually surfaced. The police need an answer, public opinion needs a target, and the truth is often hidden in the corners least likely to be noticed.
When you stare into the abyss, the abyss stares into you.
