Isolated on a secluded island, the brilliant coder Shiki Magata resides in a covert research institute, isolated from the world for years. Despite her reclusiveness, associate professor Souhei Saikawa and student Moe Nishinosono venture to meet her. Their encounter, however, is disrupted by a perplexing locked-room murder mystery. As dark secrets surface, the duo delves into the enigmatic past of Magata, uncovering a web of deception and a chilling crime within the facility's confines.