This is Project STARFALLEN!
Synopsis:
The story revolves around two JASDF pilots Junichi and Yui, who love each other but thanks to their share of traumas of past relationships, never give the next step. But the moment they decide to give themselves a chance, Rena, a hot and extremely charismatic alien elf warrior drops from outer space and makes things a lot more complicated for them, not only regarding their relationship, but she's also bringing a war that will define the fate of mankind.
Expect lots of action, fighter aircraft, conflicts, traumas and much more!
