The Girl in the Music Box Mansion

Yasuko receives a call from her classmate Kurumi that her life is being targeted, and goes to the mansion where Kurumi lives with Hiroshi. Kurumi was in a traffic accident on the day of her first day of school and has been absent from her school ever since. After hearing the details from his girlfriend Kurumi, Hiroshi summons the remaining members of the Hadogumi to the mansion. Is Kurumi's life really being targeted?