Yoiko No Shouzou summary:

Hana is a college student with nothing to do and no dreams. One day, she meets Yoiko, a self-proclaimed "grudge spirit," and is told that she is cursed by Yoiko. In order to break the curse, Hana helps Yoiko to become a Buddha! In order to clear her unfulfilled spirit, Hana uses only a sooty, blackened painting as a clue to get closer to the true identity of this beautiful ghost. Hana is gradually captivated by Yoiko's natural charm!