After the rest of the students turned on Nagito Komaeda after his attempted murder of Byakuya, Monomi untied him in the hope that the students would work together.
Miaya's avatar of Usami differs from the Usami present in the Neo World Program, more closely reflecting the personality of the person communicating with it, but still using Usami's speech pattern and body language quirks.
Miaya was going to be present at the trial of Makoto Naegi, who was a suspect of protecting the Remnants of Despair (the students who entered the Neo World Program) against the wishes of the Future Foundation, however, Miaya was murdered by Monaca Towa before she could attend.
Chiaki implored the other students to vote her as the person guilty of Nagito's death in order to protect them, and they did so, causing Chiaki to be sentenced to be executed.
As a final act in defense of the students, Monomi decided to sacrifice herself, grabbing hold of Monokuma and self-destructing.
As the Observer, Monomi would be able to advise and influence individuals who entered the program.
Based on the individual's experiences, she would take on a role which would feel familiar to them, alongside a second Observer who would resemble someone they knew in the outside world.Miaya Gekkogahara, the Ultimate Therapist and the leader of the Future Foundation's 7th Division, was a co-creator of the Neo World Program alongside Chihiro Fujisaki (the Ultimate Programmer) and Yasuke Matsuda (the Ultimate Neurologist).Miaya was a mute woman who used a wheelchair and only communicated with others through a talking, animated avatar of Usami.A second Observer, in this case, an avatar of Chiaki Nanami, was also created, based on one of the students' classmates who had been killed.However, just as Usami had begun helping the students familiarize themselves the island, a virus implanted by Izuru Kamukura activated, corrupting Jabberwock Island and allowing an avatar of Monokuma to enter the simulation.Usami was created by the Ultimate Programmer Chihiro Fujisaki, a specialist in A. programming, to take the role as the Observer in the Neo World Program, a psychotherapeutic virtual reality rehabilitation program able to help treat individuals who have experienced trauma.