Blood Moon

Saleos is an outcast of the demon world, he's been mistrusted and mistreated his whole life just because he has the blood of two different demons running through his veins. He's deemed as dangerous and unstable, and even though he has a hook on how to control himself, he does believe himself as dangerous and keeps his distance from others.
Isana is s demi human, part Salvatore demon and part human. She's a firecracker, she's stubborn, quick witted and strong, and she doesn't take crap from anyone. She and Saleos both work at the Hallowed Sword, an organization of highly trained Salvatore assassins, out to take down the Mördare, murderous demons who enjoy destroying everything in their path.
Isana recently got a promotion, allowing her to take on tougher missions. To Saleos's dismay, he was in charge of training Isana. The two clash the minute they met. Isana thought with her heart rather than her head and Saleos hated that. And Isana hated how distant and mean Saleos was and all she wants is try to be friends.
Angra and Zagan are Mördare demons, infamous demons. They run their own gang and are very notorious for vicious murders of both demon and humankind. Zagan is the leader and his only goal is to make the world bend to his whim. Angra is his lover, and he only wants to fulfill Zagan's wishes.
Zagan plans to take out their clan head and then take down the Salvatore and thrust his newly created world into chaos.
Saleos was given the job to take Zagan down, and Isana was appointed to be Saleos's partner. At first Saleos was against this, he prefers to work alone. But the more they spent time with one another, they both began to realize how well they worked together.