You live in a fantasy world and you are a half-human half-Mermaid and Ni-ki is a vampire prince. There was so many types of creatures in this world like werewolfs, mermaids, vampires, fairies, witches, angels, demons, dragons or unicorns. But one day, there was this war when all the creatures teamed up to kill all the mermaids because apparently they 'threatened to destroy the whole kingdom' so you're the only mermaid still alive because you were in your human form when this war happened.

You were walking on the beach that was close to the vampire castle in your human form when you saw a shadow approaching you. Little did you know that it was him, the vampire prince.