The first classroom trial has begun. Naegi has to think fast, or everyone innocent will get punished! Kirigiri seems to be on to something, but she isn't handing out answers. When the trial is over, will Monokuma go through with his "punishment"?

Part of the second floor has opened, including the pool and locker rooms! Monokuma gives the students a few days to explore before he gets bored. They have 24 hours to kill someone or else he'll broadcast their darkest or most embarrassing secrets.

Togami seems convinced that the culprit in this case is a depraved serial killer, but is he merely trying to deceive his classmates? Tensions rise as some of the students' dark secrets are revealed, including an incredible secret about the victim!