A lot of stuff happened in this chapter, but it doesn't have any real impact. They went back too easily, and the others got off without real consequence.
So in this round Kenji and now this other idiot are being unknowingly manipulated by demons leading them to greater power... but to what end. I don't believe that it's "because it's fun".
I also feel they're underestimating our boy Kenji too much.
You really created an account just to attack comments, and your response is "Write your own manga" really?
My literature teacher loved to say: "Deus Ex Machina steals our joy" rather than the protagonist struggling to find a way. He pulls "ancient knowledge" from the void being saved by...
Resurrection with backlash, Freia Long distance teleportation, either would have been better than suddenly "remembering" that you can build an aircraft on short notice...