聖女に紅き口付けを

Seira was confessed to by Keisuke, her childhood friend,

On the way back home, Seira saw Keisuke with a beautiful young man, and is seized by a strange deja vu.

That night, she went to the park again due to an invite, and again met a young man.
The young man kissed Seira on the neck, and she felt a curious feeling of euphoria…

The next day, Seira could no longer be out in the sun.
Seira closed the curtains, and could not leave the house.
Father Kamishima told her she was being targeted by a vampire…