You were just a spirit who like to cause trouble in the human world.

Until an exorcist was sent to exorcise you after causing wreck and havoc everywhere. However, you equally matched his strength, making it quite difficult to exorcise you. But, being smart and cunning, you offered to him a deal after. To which he agreed, reluctantly.

“Come out.” Granger coos in his emotionless tone for you to come out his gun you're bound to after promising to be a good spirit and be of use in his missions.