I Became the Exorcist Landlord to a Vampire Princess.

When a silver-haired vampire princess literally falls out of his bathtub, broke Sapporo exorcist Soma is dragged into Astralon-a breathtaking dark fantasy realm on the brink of annihilation by an ancient void-entity. Armed with nothing but a crackling taser, discount sage spray, and sheer stubbornness, this ordinary human must navigate cutthroat vampire politics and fight world-ending nightmares to help his unexpected guest save her dying world.
But as Soma and Azusa face down the Dreamer, an eldritch terror that exists outside of time and seeks to overwrite reality itself, Soma is forced to make an impossible sacrifice that permanently severs his magical abilities. Blending intense action, heartwarming slice-of-life moments, and a profound slow-burn romance, I Became the Exorcist Landlord to a Vampire Princess is an epic fantasy about finding your place in an unimaginable world, and discovering that the greatest weapon against the darkness is simply choosing to care-even when you are left with nothing but your own ordinary humanity.