Hell Girl Vol 3

From the Del Rey Manga edition

Revenge is sweet... and easy: just visit the Hell Girl's website, and this goddess of damnation will drag your enemy into the inferno. And some people will do anything for revenge. There's the girl whose best friend is scheming to steal her boyfriend... and the innocent student trapped by her unsavory employer in a haunted house. But they had better think twice - revenge may be sweet, but it isn't free!

Source: Anime News Network Encyclopedia