Sayoko Tsumura – a beautiful and mysterious transfer student at a local high school. For more than ten years, a strange game has been passed down in the high school. Every three years, a student called Sayoko is chosen by an invisible hand. This year, the “Sixth Sayoko” was to be born. School life, friendship, and love. This legendary debut work encapsulates the brightness of youth, which will eventually be lost, in a beautiful crystal, and envelops it in a jet-black horror.