Leia reincarnated as a side character in a vampire novel she currently reading. Without her acknowledgment, the parents of a side character sent her to a mystical mansion to live there. Inside the mansion, she quickly discovers that there are no normal people in the mansion and she meets the six male leads Vampire. Leila suddenly remember the death of a side character which is at the hands of a Vampire male leads. To avoid the death of a Side Character, she accepted to be slaved by them.