Time has passed since the horrific "The Legend of the Grim Reaper Murder Case" and Momoi Meguru and Tachibana Miako, the self-proclaimed head of the newspaper club, have been continuing their steady activities. However, an unexpected person stood in our way. Her name was Sakurada Shinobu. She was a classmate of mine before I transferred to Konohana Academy. She had come all the way to this school to settle a score dispute with me, and she challenged us by forming the Mystery Detective Club. One night, a fire broke out in the basketball club room. The fire was quickly extinguished, but Yuichiro Minami, a third-year student was inside and had burned to death... As if to ridicule our investigation, a series of murders occur one after another. Are these indiscriminate murders? Or is it? Now, once again, the school is threatened by an invisible monster of terror!