Guest, Miu Iruma, Mikan Tsumiki, Fox, Shinguji, Pierrot, Harlequin, Ticket Taker, Jester, and Doctor have arrived at the killing game.

And now, the rules. First, this killing game consists of the murders themselves and the Class Trials to find the culprit. Next, the explanation of the rules. Rule: Life of Imprisonment—Students must live forever in a specific location cut off from the outside world. Facility Restrictions—Accessible areas will gradually increase depending on the time or progress. Nighttime—Certain area doors will be locked at night. Murder and Trial Rules: Murder Case—If you kill someone and become the 'Blackened' (culprit), you can graduate (escape). Class Trial—When a body is discovered, all students gather for a Class Trial to find the culprit. Culprit Victory—If the remaining students fail to find the culprit, only the culprit escapes and the rest are executed. Others' Victory—If the culprit is correctly identified, only the culprit is executed.