Genius programmer Shiki Magata has lived in isolation on a remote island for years, hidden away in a research facility. While seldom receiving visitors, associate professor Souhei Saikawa and university student Moe Nishinosono still venture to seek her out. However, their arrival is interrupted when they become embroiled in a confined murder mystery. Amidst the secrecy, a macabre and implausible crime unfurls within the sheltered confines, where secrets abound. Saikawa and Moe must expose the reality behind both the murder and Magata's reclusive history.