Mangas

地獄少女, Hell Girl, Jigoku Shojo
When you thirst for revenge, there's a surefire way to get it: Simply go to the strange website that appears only at midnight, and enter the name of your enemy. The Hell Girl will appear to drag your tormentor to eternal damnation. But you will have to pay a price… your soul!
Akaza is singing and playing her guitar on a windy day when her music sheets fly away. Then a man comes up to her and asks her to sing for him?