anime about reincarnation

Asha has had a rough go of life, seemingly always ending up in situations that are the opposite of her namesake. She breaks up with her ex a few months prior to halloween and the day of the dead and takes a vow of celibacy that, little does she know, a dead ex has used to bargain his way out of hell. He didn’t come back to become her angel, just emerged from the shadows to drink her light and hopefully turn out her halo. She prays for a guardian angel to hold her through these difficult times but her gift is a territorial demon.