Monokuma gathers up shameful memories and secrets of each of the players containing secrets that they would not want to be revealed, he tells them that if there is not a Blackened in 24 hours, he would reveal them to the world.
Danganronpa: Trigger Happy Havoc
Chapter 2: Boy's Life of Despair
After Monokuma gives a vague response to Yasuhiro Hagakure's questions about Construction Site noises as explosions, he tells the students about the new motive, and the students are shocked to read them. Monokuma threatens to reveal their secrets to the world. Makoto Naegi and Kiyotaka Ishimaru tell him that no-one will kill for their secrets. Monokuma leaves depressed but warns them about wanting to see the outside world.
Kiyotaka tells everyone that they should all reveal their secrets and is about to start, when Toko Fukawa says that she neither wants to hear it, nor tell hers, a sentiment Celestia Ludenberg and Byakuya Togami agree with. Kiyotaka asks Chihiro Fujisaki, who says he'll tell his later, not wanting things to remain the same. After Aoi Asahina and Mondo Owada say they're not willing to tell, Kiyotaka says its fine, and tells everyone to prepare themselves for 24 hours time.
Chihiro, not wanting to be weak about his secret, of pretending to be a girl when in reality, he is a boy, asks Mondo Owada for assistance at the Gym, telling him about his secret. When Chihiro tells Mondo that he is strong, Mondo struggling with his feelings, succumbs to his rage and kills Chihiro. Byakuya then edits the crime scene, both to expose Genocide Jack and too see who is the biggest threat in the group.
After Mondo is found guilty. Monokuma explains the circumstances behind Chihiro's and Mondo's secrets, as Mondo was unwilling, and how it led to murder.