I'm convincing that Tanaka knows what's he doing, but he is also master of playing poker face. Yamashita knows it too, that's why she always wants to hit him. The greatest trick the devil ever pulled was convincing the world he did not exist
Ueno-san has turned the classroom into a hermetically sealed bunker. I have suspected this, but now we see proof.
I was about to ask why Yamashita was cosplaying as a squid (not an octopus, the difference is obvious), but on second thought I probably don't want to know.
This chapter confused me, for some reason. Not sure why. A good Ueno-san chapter is always bizarre, but they don't usually confuse me. I don't think it's a problem with the translation, though, so thank you for your hard work.
Also, @Tcof Are you trying to say "ahoge" or "ahegao"?