You and 16 other students are taken into a building after getting drugged on a train to Edens Garden Academy. After all of you meet up, you find a "dead body" which was part of a murder. You have to investigate and find out how and why the murder happened to be able to leave. Turns out that it was a lie, and you're all put through a killing game, where you are forced to kill each other in a murder mystery type game, where you'll be doing class trials. The killing game is hosted by Tozu and Mara.