Cellphone Investigator 7

Kirihara and Third (1x40)

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Thirteen years ago, a person named himself "Akatsuki" on a bulletin board on the Internet and actually caused a family murder. The police still cannot identify the criminal and remain unsolved. Kirihara, the only survivor, continued to follow Akatsuki's footsteps. And he finally succeeds in contacting a person who seems to be genuine and promises to meet.