On the normal, unchanging campus, it suddenly occurred; A murder case where a body was cut open, right into two.<br />On the other side of the unsolved case, the rumor-loving high school students became involved in a certain ritual.<br />From the extremely popular songs on Nico Nico Douga, begins the Project.<br /><br />What is the “Bookmark of Demise”…? <br />Who is the traitor…? <br />What will the conclusion to this story be…?<br /><br />So, can you solve this mystery?