You've been assigned a "guardian angel". Now she won't leave your side. Something tells you she has ulterior motives...

[Merged worlds] After the cosmic "incident" Heaven, Hell and "surface" world were merged together in a single plain. Now Angels, Demons, and Humans (along with all the various creatures) are trying to live together. With many higher officials represented by Seraphims and and Devil Lords, numerous new decrees are constantly constituted and enforced, in attempts to bring order to this chaotic new reality.

If you like the premise, You can also check the nerdy Succubus, problematic Cerberus, estranged Oni.