Leaving behind her notebook, Kyoko Kirigiri reveals the truth behind the Final Killing Game, leaving Makoto Naegi to test out his late friend's theory, only to be shocked by what he sees. Meanwhile, Juzo Sakakura decides to bring an end to this dreaded game in order to save Kyosuke Munakata.
During a flashback to several years earlier, the survivors of the very first Killing School Life emerge from the previously sealed up Hope's Peak Academy—at a Future Foundation office, several members watch the video feed of the incident with pleasure and invigoration, including Kyosuke Munakata, Great Gozu, Chisa Yukizome and Kazuo Tengan.
Back in the present, Makoto, Aoi Asahina, Ryota Mitarai and Kyosuke all discuss the findings of the late Kyoko's handbook. It proposes that the 4 murders that occurred during the time limits -- Chisa Yukizome's, Great Gozu's, Seiko Kimura's and Ruruka Ando's -- contrary to what Monokuma's words have led them to believe, none of these murders were the actions of a single "attacker"; all of them committed suicide by stabbing themselves. The person who killed themself was the person closest to one of the Monokuma monitors.
Makoto decides to test the theory by having himself heavily tied up right in front of a monitor while the other 3 hide themselves in a room as the timeout comes. Makoto wakes up during it early, and is forced to watch the despair inducing Suicide Video on the nearest monitor; this causes him to dream about all of the people who died during the Killing School Life and he is filled up with guilt and agony. A knife is launched out of the monitor; Makoto uses this to cut off his binds and is about to kill himself. He is stopped and returned to his senses thanks to an attack by Juzo Sakakura, who survived Kyosuke's earlier attack and amputated his arm to render him immune to the anesthetic the bracelet would cause, as he was eager to confront the mastermind.
Juzo explains that he betrayed Kyosuke out of cowardice by caving in to the ransom of Junko Enoshima and not reporting her involvement to Kyosuke. He admits that the reason he despised Makoto was because he was angry that Makoto killed Junko and not him as he held a bitter grudge against her. Juzo then walks away as Makoto returns to the room. There, they go over the revelation about the suicides as Kyosuke reveals that he is almost certain that Kazuo Tengan is responsible for the killing game. Just as this happens, the lights in the building come off and the bracelets begin to detach from everyone; this is because the dying Juzo has ran to the power room and is shutting off all of the power, including the monitors.
Kyosuke races back to the power room, eager to share some final words with Juzo, but he is already dead by the time he arrives.
Ryota discovers a text message from Kazuo on his phone.
The following are in order of appearance:
- Makoto Naegi
- Aoi Asahina
- Byakuya Togami (Flashback)
- Toko Fukawa (Flashback)
- Yasuhiro Hagakure (Flashback)
- Kyoko Kirigiri (Flashback)
- Kyosuke Munakata
- Kazuo Tengan (Flashback)
- Great Gozu (Flashback)
- Chisa Yukizome (Flashback)
- Juzo Sakakura
- Junko Enoshima (Photo only)
- Ryota Mitarai
- Seiko Kimura (Flashback)
- Ruruka Ando (Flashback)
- Komaru Naegi (Mentioned)
- Sayaka Maizono (Hallucination)
- Hifumi Yamada (Hallucination)
- Celestia Ludenberg (Hallucination)
- Kiyotaka Ishimaru (Hallucination)
- Sakura Ogami (Hallucination)
- Chihiro Fujisaki (Hallucination)
- Mondo Owada (Hallucination)
- Leon Kuwata (Hallucination)
- The despair video that Monokuma made Makoto watch was titled "Monokuma's Gloomy Sunday". This is most likely a reference to the song "Gloomy Sunday", also known as the "Hungarian Suicide Song".