Ep. 9: The fourth locked-room murder mystery involves two suspects unsure of their guilt.
Aired on August 29, 2013

The narrative centers on the fourth murder case, which presents itself as a locked-room mystery. Two primary suspects are involved, yet neither is certain whether they actually committed the crime. The protagonist, Naegi, must analyze the available clues to determine the truth behind the events that occurred in the game room. This investigation requires careful deduction to resolve the uncertainty surrounding the suspects' actions and uncover what really happened during the incident.
Episodes
- Ep. 5 · Togami suspects a serial killer while secrets about the victim emerge
- Ep. 6 · Asahina Discovers Fujisaki's AI Alter Ego Amidst Ishimaru and Yamada's Rivalry
- Ep. 7 · New Century Galaxy Legend Returns: Armored Hero Stands on Earth Not Normal Arc
- Ep. 8 · Monokuma reveals a mole among students, worsening the rift between survivors
- Ep. 9 · The fourth locked-room murder mystery involves two suspects unsure of their guilt.
- Ep. 10 · Kirigiri Steals Monokuma's Treasure and Togami Discovers the Robot Malfunctions
- Ep. 11 · Naegi faces a confusing trial regarding an unknown victim while suspecting Monokuma's hidden agenda
- Ep. 12 · Naegi Investigates the Principal's Notebook for Clues Amidst Rising Despair and Murder
- Ep. 13 · Naegi and classmates investigate Hope's Peak High School mysteries in the final trial