Slayer of Gods

There are gods, demons and people in the world. Almost no one has seen the gods, but demons often come to the human world and therefore a Private Detective Agency was created that hunts for demons. The main character Kenji is one of those in whose soul a demon lives, whose will is suppressed and executes people's orders... but how long will it be like this? Kenji is half a demon and he is subject to destruction, but a Private Detective Agency became interested in him, which is secretly engaged in the destruction of demons and since then Kenji has been working for them, otherwise he will die