Magada was arrested on suspicion of killing her parents when she was 14 years old, but when she was interrogated, she firmly stated that it was a doll killing, was judged to be mentally ill. Magata is a genius programmer who has been conducting research on an isolated island. She is no different from 15 years ago, and she speaks coldly like a robot. Menghui is a girl with strong mental arithmetic ability. The death of her parents in an air crash has always been her nightmare. Xi Chuan, her father's apprentice, took good care of her, and gradually she fell in love with Xi Chuan, and became hostile to the girls who appeared by his side. Xichuan is only interested in scientific research. Xichuan regards Magata as an idol, and he wants to go to the island to find the idol's research institute for a seminar trip. A bunch of them came to the island together, but even Yamane, the staff member of the island, met her through the screen. When everyone came to the research institute, they found that Magatian was dead, his hands and feet were gone, and he was wearing a wedding dress strangely. They found that they could not communicate with the outside world, so they could only deduce the murderer by themselves