Vandread/WMG

The Paksis is crystallized Spiral Energy.
Okay, let's see here. Shining blue-green, endless power source, fuels mecha combination, tied into human emotion especially love... Sounds like Spiral Energy to me.
 * Perhaps it's even a post-TTGL Restraining Bolt method for controlling Spiral; Energy in order to prevent Spiral Nemesis.

The attempt to fuse the cultures of Taraak and Mejeer will fail horribly.
So, their plan is to send a sampling of volunteer men and women down to both planets and have them live together to prove that it isn't so hard? What happens if someone on either planet accuses heterosexuality as sinful, or a politician from the planet (rather than admitting to being wrong) tries his hardest to disprove the Nirvana crew/volunteers.
 * Fanfic, of course!
 * Then again, they just fought against Earth fleet and they got atleast 1 planet where heterosexual relationships are norm close enough to supply ships. Trying to condemn few heterosexual pairs would mean they would attempt to condemn one their allies. That has vastly better fleet.

This takes place in an Alternate Universe of Legend of Galactic Heroes.
Specifically, one in which the Earth Cult's conspiracies were far more successful.