That was a rare occurrence. Usually I have to make myself finish a book on kindle outside a Dr's waiting room. This one was an engrossing read. Also confess that I paid real money for book 4 before coming here to declare "I finished it!" with books 1-3, because gosh darn it, I want to know what happens next. Also, it's pretty much a cliff hanger ending, with the MCs going off on an unauthorized adventure, and a couple of their party going back to report, so yeah; there's a pressing need to read book 4.
I'm not sure what you would call it - there is romance here and there, but the main focus seems to be the fantasy itself, with the romance as a reason to redeem or accept an otherwise unacceptable character.
In any case, book 1 opens with our main H - a pilot - getting sent off to the fantasy equivalent of Siberia as punishment. In the meantime, our main h is about to wake up from a 3 centuries long nap. She, with the aid of her sentient sword, have great fun hiding in plain site.
Book 2 opens with one of the pilots who serve under the H in book 1 being tossed in the enemy's prison, and finding herself sharing a cell with a pirate of sorts who is more a scientist than a bad guy. Much adventuring is had
Book 3 has our previous couples, along with a few others, going off on a mission into enemy territory...and also to rescue a girl.
This isn't a really...deep...series. OTOH, it is entertaining, and sometimes that's what one is looking for. And I'm good with that.