This was filler but still entertaining. I totally forgot that this is a '.5' chapter.
"Beating the Kaijin? Nah the fanservice must come first." - The author (probably)
This also makes me question the nature of the Kaijin even more. Are they people? Former people like in OPM? Animals that evolved? Aliens? Spirits?
All we know is that they were supposed fit that "villain of the week" trope as in tokusatsu but now they're really more like... people?