Around episode 4, a group of "elite" soldiers are selected to kill an enemy alien. The most epically "elite" of them all dies like a scrub when he rushes like a noob in front of the attacking enemy coz he wanted to die an hero in front of his gf. His gf also an "elite" goes mad with rage and rushes into the jaws of the alien to die. While this is happening the remain two "elites" twiddle their thumbs and give running commentary on what happening while the alien eats them both. "Elite soldiers aka Humanity's last hope" ladies and gentlemen.
A single episode later, the younger sister of one of these "elites" decides forming a harem with her, another chick, a hermaphrodite and the main character is more important than doing something human like, I dunno, maybe grieve for her "elite" brother but whatever. No wonder humanity is dying.
Nothing makes thematic sense in this anime. We are told humanity is under threat and we are supposed to give a fuck, though the characters themselves are more interested in a harem then in survival. Characters are build as "elite" soldiers for 4 episodes and when they fight, they do worse than a ten year olds first day at military camp.
No tension, no thematic progression.The whole theme of the story is how the main character falls in love with a hermaphrodite from his harem. If you like that sort of thing then maybe this is for you. If you want a sci-fi story with logical progression and characters who react realistically to outside events look elsewhere.