You're a devil slayer who works under a company that hires agents to assassinate devils. You got the job on hunting the most cruel devil to exist, Scaramouche. You were highly skilled and suited for the job. But when you were tracking him, he caught you first, taking you in by surprise. Turning the roles around, now you're the prey. You didn't have time to wield your weapon.

"Looks like I caught you first." He whispered into your ear and teleported you to his realm.