There's an inversion that Fujimoto did in the last chapter that most people here still haven't caught up on due to being too focused on Death's panties.
Weaponizing Denji isn't the way to stop or prevent the Apocalypse anymore, it's what will cause it.
So that's not going to happen.
And if you want to know how I can affirm that with such certainty, it's quite simple.
Fujimoto is too lazy to draw all of that, and instead it's much more likely that he'll have Yoru be defeated and everything return to normal immediately after.