User blog comment:Seieireppa/God Eater ∑: The Maxim of Possibility, Final Chapter/@comment-14812118-20150416203944/@comment-1419424-20150416205711

Pretty much, yeah. The Gehenna was the only thing holding the future timeline(s) in place, so by forcing a reset on the Gehenna, Nanako essentially rewound the timeline to its origin point, the point at which it split off from the "good end" of the original GE∑. The Gehenna did still exist, as evidenced by the ending bit, but this time, they succeeded in defeating it again...

...or WAS it "again?"

But yeah. I intended for the climax of the story to be the latter part of the previous chapter, when she makes up her mind to throw away her own existence to set the future right again.