Tenraku Akuma! Demon's Core

An exorcist has just concluded a grueling battle against a formidable, seductive demon when an unexpected intruder crashes through the ceiling. Rather than facing another terrifying adversary, he finds himself staring at a pathetic figure who could not be further from the dangerous entity he just defeated. This newly arrived demon lacks horns, wears tattered clothing, and is visibly starving. Although she boldly declares that she has come to claim his soul, her frail state makes it abundantly clear that she poses absolutely no threat whatsoever. Instead of executing the helpless creature as his profession demands, the exorcist finds himself unexpectedly overcome by pity. Choosing compassion over duty, he decides to buy her a meal rather than strike her down. That single act of kindness drastically alters the dynamic between hunter and prey. Grateful for the food and suddenly devoted to her reluctant savior, the little demon resolves to follow him everywhere he goes. Now determined to tag along on his journey, she eagerly attempts to make herself useful in any way possible, transforming what should have been a routine exorcism into the beginning of a highly unconventional partnership.