Makiko

Makiko is the ugliest demon in the entire demon realm and vows to gather human souls in exchange for the chance to be beautiful. Disguised as a young girl she infiltrates people's personal lives and sends them on a downward spiral to the pits of hell...

Serialized in Horror & Occult Kyousaku Daizenshuu, best to read one story every once in awhile as they pretty much tell the same story over and over...