Scarlet Temptation

(from ebookjapan):

A hospital specializing in occult problems! Dr. Anri is a soul doctor with amazing psychic abilities. She is accompanied by a powerful guardian spirit, Ushiro.

She has a powerful guardian spirit, Ushiro, who is hostile (?) to her. Dr. Kaga, who abhors the occult as an enemy of modern medicine. How will the occult confrontation between Ushiro and Dr. Kaga end?