Kirigiri steals Monokuma's treasure. He warns the students that everyone will be held equally guilty. Later that night, Togami finds that Monokuma has gone out of order. The next day, there is a new body.
The fourth murder case is a locked-room mystery. Two of the primary suspects for the murder aren't actually sure if they did the dirty deed or not. Naegi tries to piece the clues together to figure out what really happened in the game room.
Monokuma announces that he planted a mole amongst the students. Rather than let them figure out who it is on their own, he generously offers the information. Now the rift between the surviving students is worse than ever before.
Two students have been killed in a row, and all of the evidence seems to point to Hagakure. But the way Naegi sees it, things just aren't adding up quite right. It's possbible that Hagakure is being framed.
Asahina finds Alter Ego, an AI created by Fujisaki. Ishimaru and Yamada are smitten with the program in their own ways, and neither boy wants to play nice and share. After the laptop goes missing, a suspicious character begins attacking students.
Togami seems convinced that the culprit in this case is a depraved serial killer, but he be simply trying to deceive his classmates. Tensions rise as some of the students' dark secrets are revealed, including an incredible secret about the victim.
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 he'll broadcast their darkest and most embarrassing secrets.
Makoto Naegi gets a lucky break and enters the highly prestigious Hope's Peak High School. But things take a turn for the worse when Makoto learns that he's trapped in that school for the rest of his life unless he kills a classmate.