Jianyin Village is a remote village that is almost isolated from the outside world. Torii Yunrin, a young boy in Tokyo, temporarily stayed at his uncle's house in Miyakumura to recuperate due to heart surgery, and met several local friends: the energetic Masumi Matsui, the gentle and virtuous Jasmine Akihara, the joke-loving Kazuya Anjo, the sinister Risa Naeno who loves pranks, and the mysterious girl Kankai Rukia.
However, the quiet life did not last long - the deaths of people around him broke the peaceful atmosphere of the village... What are the inexplicable "Three Commandments of Seeing and Hiding"? What secret is hidden behind Lucia's watery smile? Will you be the next person to die? Is it really impossible to escape no matter where you go? Is the murderer a human being, or is the so-called "Hidden Princess" seeking revenge?