(Not) Normal Arc: Return of the New Century Galaxy Legend! O Armored Hero, Stand upon the Earth!.After the others investigate the newly opened third floor, containing a rec room, an art room and a physics lab, Monokuma announces his next incentive: a cash reward of 10 billion yen to whoever graduates, though nobody seems to fall for it. Afterwards, the gang discover a laptop, which Chihiro had left behind in the bath locker room, containing an A.I. program called Alter Ego who offers to help decrypt some files left on the laptop. When Kiyotaka asks Alter Ego if he blames him for Chihiro's death, he imitates Mondo to give him words of encouragement, proving a bit too successful. Alter Ego then shows a curious photo of Leon, Chihiro, and Mondo hanging together, which could not have possibly been taken during the time they've known each other. After Kyoko takes precautions following some unhealthy interests from both Kiyotaka and doujin artist Hifumi Yamada, Alter Ego suddenly goes missing, leading Byakuya to suspect that there may be a mole amongst their group. The next morning, Makoto, Kyoko, Aoi, and Sakura encounter Celestia, who claims to have been attacked by someone in a robot costume who took Hifumi hostage. After finding an injured Hifumi in the library and taking him to the infirmary, the gang split into groups to search for the perpetrator. While Byakuya's group chase after the perpetrator, Makoto's group returns to the infirmary and discovers Hifumi lying in a pool of blood, with Monokuma's 'corpse discovery' announcement suggesting he has been killed. Makoto rushes to inform the other group in the physics lab storage, where he discovers Kiyotaka has been killed as well. Upon returning to the infirmary, the group find Hifumi's body has gone missing, later discovering Kiyotaka's body has also disappeared. Discovering the bodies in the art supply room, Hifumi seemingly comes back to life, stating he may have met everyone before and leaving behind the name 'Yasuhiro' before passing away, at which point the 'corpse discovery' alert plays for a second time.