Naegi Ikari, Kirigiri Wright, Setogami Kaiba, Snoop "Dogg" Yasuhiro, Tsundere Fukawa, and Mikuru Asahina were all outside the Vault tec door to the outside world. Luckily they packed enough heat to fend off the Super Mutants, Raiders, Radscorpions, and other shit that kills people in the Fallout universe (except Deathclaws because unfortunately Mukuro didn't have any rocket launchers in her dorm).
"Ay mah nigga we gon smoke our mothafuckin asses off out there in weed world" said Baggy.
"I can't wait to classify all the information outside." said Miltank.
"Now that I have all three Blue Eyes White Dragons and my revolutionary state of the art DUEL DISK SYSTEM I can kill I mean beat Yugi Moto in a card game." said the Monopoly Smith.
"I wasn't doing it for YOU, b-b-baka!" - said JK Killspeoplewhenshesneezes.
"My deductions show that the writer of the story is too much of a gay ass faggot to make a clever Ace Attorney reference." said L LOL 1337.
"All right, let's open this mother fucking door and get the fuck out of here like #YOLO!" said Naegi.
He then pushed the big red button labelled "if you push this the building won't blow up, we swear". Then, like they've been practicing since before Maizono died while pregnant with Naegi's babies, they all got out of there dancemarching backwards, flipping off Junko's corpse and all the dead Monokumas, while playing "Dream a Dream" on Maizono's Zune that was given to Naegi as a parting gift.
Then they died because patrolling the Mojave made them wish for a nuclear winter.