Return to form is something from chapter 4, the US is seen before relating to Sekai and Akira though. From here on is about the events i'm referencing:
This is the first time Sekai was "seen" by Akira in game. And it could double on the theory that present Akira sort of is Sekai as well, since that's his own shadow and young Akira is seeing him.
Then we have Noodles and Himawari present on Sekai's return - granted, Noodles could just be observing, and Himawari could just be making sure his head doesn't explode.
On an unrelated noted, take notice of the red and green being her colors apparently, as they are both colors from Nao's eyes. No idea what 1+1=3 is though, probably a reference to the rope between dark and light also being a god since this is still in chapter 2.
Anyway, I'm not sure if Wires is for or against Sekai's return, but he definitely seems involved in Akira's memories returning. If Sekai was an unintended consequence or part of his plans I don't know. Same goes for Himawari, as her primary personal directive (other than her survival) seems to be protecting him from breaking/unnecessary pain - basically everytime Himawari or Himawarico appears is damage control (with the exception of Ayane).
Now to something very unrelated, rewatching spotless mind really makes you think about Wires being someone we know, he seems so caring about Akira there. Probably just a misdirection but still, it's eerie - especially since his actions there seem to mirror Noriko's.