Uta no Yobu Mono

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Client visits Detective Hayakawa and asks to investigate the truth behind his friend's suicide. How can this case be connected to the urban legend about a poem that causes brings death upon reading? [From [url=https://vndbreview.blogspot.com/2020/08/vn-of-month-august-2008-koisuru-otome.html]vndbreview[/url]]