Forced Shutdown

Forced Shutdown It is a system used to purge the "New World Program" as a last resort if anything were to go wrong. It will result in freeing all the students still 'alive' in the game, but, according to Makoto, it will be unable to ovewrite their memories with that of the memories from the game (thus returning them back to how they had been before entering the program).

Makoto created this system just in case if something went wrong, like Usami spreading despair instead of hope. It was programmed to be activated by at least half of the class (8 students) pressing both "Graduation" & "Retention" at the same time. Once activated, not even the teacher/AI in charge can stop it. It also acts as AI Junko's execution.

Execution
When the "Forced Shutdown" is activated, cracks began forming in the space. It soon shattered, revealing Usami in her Magical Girl form. AI Junko attempts to crush her with her right hand, but Usami dodged and pierced an electric spear on her hand. This causes AI Junko to be electricuted and caused her to drop her cellphone. AI Junko then tried to smash Usami again with her left hand, but Usami dodged & pierced her other hand with another electric spear. After being electricuted again, AI Junko can't move her hands since they're pinned down by the electric spears. Usami then used a colorful, sticky wipe which stuck to AI Junko's forehead. Usami then pulled AI Junko and causing her to smash her face on the ground & lose consciousness. Usami then kicked AI Junko on the forehead, causing her to regain consciousness and free her hands.

Usami began flying aroud AI Junko's body, leaving a rainbow trail. The rainbow trail then tightened, acting like a rope and constricting AI Enoshima. Usami then formed a rainbow circle with her wand and casted a spell, which caused the rainbow trail that was constricting AI Junko to glow. It then exploded, "segmenting" AI Junko where the "rope" had constricted her, causing her to break into millions of cubes, thus 'killing' her.

As AI Junko's body break apart in nothingness, Usami spins around into the air and exploded into millions of colorful hearts, a sign that she has finished her job in stopping AI Junko and her love for her students.

Aftermath
After the Forced Shutdown was concluded, Makoto Naegi, Kyoko Kirigiri and Byakuya Togami departed from Jabberwock Island by boat.

The survivors of the New World Program opted to stay at Jabberwock Island.

Despite the fact that the Forced Shutdown was repeatedly described, by both Makoto and Junko, as causing the New World Program to be unable to overwrite the memories of the participants, Hinata Hajime was no longer in his Izuru Kamukura form, and apparently retained knowledge of his time inside the New World Program - mentioning that the "incident is finally over". It is not explicitly made known if the same applies to the other students.

Trivia

 * This execution is the only one in the series to use 3D models rather than 2D sprites.