Tomie

Tomie is an entity in the form of a beautiful woman, who destroys the life of innocent strangers just because she can. 
No matter how many times you kill her she will spawn right back.

This is a pretty gigantic book in the form of short stories and it was really fun to read about. 
Also it's really cool that you can see Junji Ito's art style evolving as you read more and more.