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One summer day in 1994, Ren Ishida had a dream. In the dream, his sister Keiko, whom he had not seen for seven years, suddenly disappeared while talking to him on the phone. This nightmare reflected reality - Keiko was murdered. Lian was confused - why was an English teacher at a cram school with a simple life killed in Akagawa, a place with good security? Although they talked on the phone once a week, he didn't notice anything strange about his sister. He didn't even know if she had a boyfriend. A confused Lian went to Akagawa, assisted the police in the investigation and took over the job that Keiko had left before his death. Unknowingly, Lian began to live the same life as Keiko. He did not deliberately investigate the cause of Keiko's death, but there seemed to be a force in the dark that helped him get closer to the truth. In ordinary life, inconspicuous clues were intertwined, and Lian found that he had just begun to truly understand his sister - why was her hair color different from the rest of their family? Why did she leave Tokyo for the small town of Akagawa? Who is she dating? What had she experienced alone in the past few years when they rarely met... As the mysteries were solved one by one, Lian gradually understood things that he had never cared about before, and finally had the courage to return to his own life and face his own reality.