LogFAQs > #960389970

excellent game. but i feel like my caveman brain cant piece together everything that happened

so basically morimura the original caused the extinction of humanity, but her memories+personality got uploaded into project arc, where she then inhabited chihirus body and began her plan to position herself as leader of the new human race
shinonome is a doomer and sabotages project ark, implanting the the deimos code in an attempt to guarantee humanity doesn't continue
millions of years later, the ark reaches new earth, builds the pods, and begins incubating the 15 MCs
everything ingame is a simulation, corrupted by the deimos code
after various loops, some people eventually figure out how to use sector 0 to save themselves from the deimos before a loop, leading to the events of the game

What I don't understand is why Morimura is trying to sabotage everyone before Gouto convinced her not to. Nor why this was their last chance to defeat the kaiju.