I always had an uneasy feeling about the Miyoshi brothers, but they looked vague enough to deceive me... until now. EEEWWWW. Seeing them fly was the worst, flying c-bugs are stuff of my nightmares. At least they got dealt with in the gruesome way they deserved.
The smaller ones that Jinbei & Co fought with weren't any better... brrr.
By the way, I loved the random anachronisms - making your own death flag, huh?
And everyone using the "G" euphemism for "cockroach" in all seriousness was hilarious. xD (HareGuu still has my favorite euphemism, though: "A black, hard, shiny creature that likes small, dark places, and is pretty fast". It's also my favorite story involving cockroaches.)
I didn't expect this kind of indepth look into Koikawa's psyche until now, but I guess by shounen fight manga standards I should have... It was a nice surprise, though, definitely a change of pace, what with how dark the episode got at some points.
So next time it's Tenma vs tokusatsu bug, huh? It's time the kid got some spotlight.