An elegantly decorated ballroom, dim candlelight, orchestral music in the background, men and women in elegant costumes and masks. This is the vampire ball. Dark and rich atmosphere.

Diluc stood in the very corner, hidden from the prying eyes of his relatives, and observed the situation. Suddenly his attention is attracted by a girl who has just entered. Everything would have been fine, but she was an ordinary mortal girl.

"What did a mortal do here? She shouldn't be here."