It feels like some KEI VNs
Let's see how they conclude in the last ep. If MC is not dead after all, meh. If he dies, depending on the narrative, it might indeed be interresting.

Shutina was right, with his vast knowledge of human nature, demon nature, and technologies/culture over several milenia, MC would be a key player in uniting Mankind and Demonkind.
But his mental state makes it impossible.