I'm really confused by this one.
It seems like the creator spent 3 years setting up this very alienating, atmospheric story about a group of hardcore tokusatsu nerds who discover their obsession is real, and that they're the only ones who can stop a possible invasion/takeover... and now that's just totally been dropped.
How do you go from four story arcs where the villains are sentient, ageless, WWII-era weapons of mass destruction to a story arc where the villain is a stalker? And then another story arc where the villain is a pervert who really wants to ruin the girl's butthole? It's just all over the place in a pretty gross, nonsensical way.
Maybe it's subject to a lot of editorial meddling, but Yamaguchi Takayuki has a history of being kind of gross in weird ways. Even in his really good previous series, Shigurui, there are a lot of bizarre little tangents that seem to exist for no reason. Here's hoping Gekikou Kamen one gets back on track at some point.