One domestic, dark, cockroach which flies badly, but ambitiously trying to do it better.
Thanks to a firefly in love, or maybe it is just a compassionate firefly, the cockroach will overcome an impossible and insurmountable obstacles through the great efforts and eventually fly.
He will fly with her, but honestly just because holding fast to her back.
In this, almost classic movie story, two characters have met, he who lives from the dark and she who lives from the lights. The Nature would never have thought that they could be happy together.