Akio Mimi

Himari was saved by a vampire as a child. Now a high school student, she lives wanting to meet that vampire again.

After Shiori loses faith in her piano playing, she meets a weird Physics Professor who asks her to teach him to play the piano.

Death God candidate Yuzuki's final test is grabbing a human soul. In order to do that, she'll have to charm her quarry with her singing.