Such a beautiful amazing chapter. So apparently we're going to be looking at (my guess) how dreams influence IRL behavior. That's cool. Also, I feel like dreams could be used to send secret information (perhaps) though I doubt that this would actually come up...
Also, on page 3 they foreshadowed Mikoto being interested in the Gekota strap. This at least acknowledges the Punishment game when Touma and Mikoto go as a couple so that she can get the strap. I noticed it!!!
It makes me happy though--that was a pretty small reference. That arc also happens right after Touma gets back from Italy... so it really does fit.
Though I suppose it probably won't happen in Railgun.
Also, I feel so bad for Kuroko.
And now the dream makes sense and dream rankers sound interesting. Another excellent plot idea. The only thing to keep in mind is that it is probably guaranteed that this ties into AC's darkness in one way or another.