A race of horned aliens and a race of winged aliens have been at war across the galaxy for millennia. They've outsourced the business of war to many other races in a variety of places. But two soldiers from the opposing sides have fallen in love. And she's pregnant. And a galaxy-wide hunt has been kicked off to find them.
If you require hard science fiction, or at least scientifically plausible science fiction, avoid Saga. The first volume is fun and breezy in that often anomalously snarky Buffy the Vampire Slayer way, though both the writing and the pleasant artwork from Fiona Staples rapidly evaporate in one's memory. Maybe you'll enjoy it more. A volume made semi-famous by an episode of The Big Bang Theory in which the nerds get all hot and bothered by the mother breast-feeding her baby on the cover. Yeah, hubba hubba. Losers. Lightly recommended.