The Guardian Legacy Series (0.5-1-2-3) by Ednah Walters

The Guardian Legacy Series (0.5-1-2-3) by Ednah Walters

Awakened (#0.5- Prequel) Most teens turn sixteen and get the license to drive, but Lil Falcon gets the license to kill demons. Orphaned as a child and raised by an eccentric grandfather, Lil is concerned with surviving high school and is unaware that she's a Guardian-a being with super powers charged with killing demons and protecting humanity. When she meets Bran, a mysterious boy with amazing abilities, his psi energy unlocks her latent powers. But Bran has a secret that can ruin their growing relationship, and the truth she discovers may destroy everything she believes in unless she finds the right balance between love and sacrifice.

Betrayed (#1) Lil has come to terms with her life as a Guardian/demon hunter and the wielder of the Nephilim most powerful weapon. But trouble looms in the Guardian enclave. Bran is pulling away from her and her best human friend is in trouble, and it's all Lil's fault

Hunted (#2) Bran and Lil may have escaped an attempt to lure Lil to the dark side, and recovered the contracts damned people signed with Bran when he was a soul collector, but someone forgot to tell them that no one switches sides or cancels contracts without consequences.
Hunted by an unknown but powerful enemy, Lil, Bran and the Guardians must seek help from unlikely sources to avert total annihilation of the Guardians. When they finally face their enemy, one of them may have to make the ultimate sacrifice.

Forgotten (#3) "Forgotten" takes the Guardian Legacy series in a new direction, as Lil wakes up on Mount Hermon Island after months of unconsciousness only to find that she has no memory of her life before waking up. As she learns about life there, and deals with her father and half-sister, she learns about the rules of society among the Hermonites and champions the cause of the minions, those who were unlucky enough to be born without powers. As she moves forward toward fulfilling her destiny as the one who will unite her people, she has to balance her responsibilities and her love for Bran.