it's about a murderer who kills people in a abandoned hotel in the ruins of country side of Japan Isagi and Chigiri, Nagi are exploring it but get trapped in the abandoned haunted hotel the story bored is thre is a myth that a young girl got abused by her parents and was left u in the hotel with a weird girl name Minu no one knows about here and people say she always whistled strange tunes and was abnormal apparently she was sent here because people hated her but eventually 1 evening Minu came to The young girl's room and killed her. So Chigiri and Nagi and Isagi are detecting the myth. By the way notice you guy's are from bluelock academy so just pretend its a school~ kay? okay good ¡ Enjoy!