８０年前，男的教畫畫、女的教彈琴，在同一高中內二人靜靜地戀上。情事不能公開，男的只可在隔壁偷聽她的琴聲。一天鋼琴搬走了，男教師突然失蹤，女的便傷心而終。多年後，戲劇組女學生自殺身亡，沒留下遺書，餘下的竟是８０年前女教師愛彈的那篇樂章！她的戲劇遺作中，又竟與十誡中的引言有關？怪事接踵而來，命案也離奇地相繼發生。更離奇的是每宗命案，都似乎與新來的男生有關…改編自日本暢銷過十億的「死者之學園祭」。                                    
                               　　80 years in the past, an unfulfilled love between two teachers in Tezuka Academy tragically leads to mysterious death. Many years later, Yuko, a Drama club student, kills herself by jumping off the school rooftop, leaving no suicide note but a pieve of music that the dead music teacher who used to play. Yuki, the best friend of Yuko, decides to stage a play Yuko failed to finsish. but when Yuki begins to suspect that a quotation from the Old Testament in Yuko’s script is in fact a last message, tragedy strikes around her.