It's just an everyday apocalypse. Four years ago the aliens invaded Tokyo. Nothing was ever the same again. But after a while, even impending doom starts to feel ordinary.
The end of the world really sucks--rogue AI, foreign occupation, constant firefights between freedom fighters and terrorists, sudden death raining from above. How do you even begin to start over in the middle of all that? Maybe you can't. Maybe you just have to reset. This is the end!