Junko is about to corner Saiyaka when Mondo shows up. 'Yo back the hell off!'
Junko asks 'what is this?' Mondo tells her 'i have to stop you from killing Saiyaka or else Hina and Sakura's deaths will have been for nothing so stand down.'
Junko snaps 'I'm not gonna take orders from some lame pompadour! '
Mondo replies 'big mistake!' at the last second, he clocks Junko over the head with a pipe he grabbed off the floor, causing her to die and drop the release button for the door. He then approaches Saiyaka and says 'there we're all free meaning your free to sing with your band, or start a family with Naegi or whatever you want to do.'
At the entrance Saiyaka says. 'thank you Makoto, you encouraged so many people to protect me. How can i ever repay you?'
Makoto says 'I'll give you a hint. (stares with flirty eyes)
Saiyaka replies 'you want me to be your girlfriend and eventually your wife? so be it. It's the least I can do.'
So everyone who survived got what they wanted and it's a happy ending for all except for those who died. (Hina, Sakura, Togami, Mukuro Yamada and Junko) the end