The thing that I find odd in this series is that The theme of the story is about humanity is on the verge of extinction, but I never get the impression that humanity is on the verge of extinction by huge bugs and that there is some sort of survival going on here.
All aboard for a fantasy train ride into your imagination: through an imaginary burned out building with hot and sweaty men; into a mirrored kaleidoscope of oily, wet and slippery reflections; in a boxcar orgy with sexy black, Latino and white men all riding the rails on the Black Bullet! However, starting at episode 5, that cheetah crashes into a brick wall and stops dead in its tracks.
The loli harem is there for comedy relief and pandering.