Heiye Yousuo Si

Hated by those around him for seemingly bringing bad luck wherever he goes, Ren Xi unwittingly makes a pact with a witch named Nyx to save his sick mother. But there are consequences... If only Nyx could remember them! It doesn't help that she has amnesia, either. It seems there's something more to Ren Xi's "jinxed" past, too... something scarier than even a witch, and they'll need each other to get through it.

(Source: Comikey Media)