＜Silva＞, a video-creator who was rising in popularity, was found strangled to death in a cabin in the mountains. Yoshikage Maruta, who happened to be in contact with once before the incident, invites the victim's friend Yuya Kira to join him in the investigation. As it proceeded, a number of puzzling points emerged, including "a murder committed in a locked-room," "the disappearance of the owner of the house," "the suspicious death of the victim's lover 〈Milley〉," and "the unusual behavior of his previous lover 〈Choice〉." Maruta spotted the video-creators' group who were accompanying the victim on the day of the incident. They had ample opportunity and motive to kill . Each of the five would only identify themselves by their Internet handles: 〈Captain〉, 〈Kirvy〉, 〈Shaggy〉, 〈Mont Blanc〉, and 〈Number 4〉. Behold the purpose of the unidentified 'Obscure Guys' and their out-of-the-ordinary locked-room murder techniques.