For two hundred years, Stellar has walked between light and dark: half-human, half-vampire, outliving every mortals. He has one purpose— to find Caelios.

His search leads him to the Meijiro, and to her: Hanazawa Mitsu. A siren stripped of from the seas, sold into slavery as an oiran who eats the hearts of those who fall for her song.

Together they leave the only refuge Mitsu has known, joined by Kaito— a young and naive monster hunter, follows where they lead. Across the world, they chase clues: from hidden auctions to forgotten sages, from the White Camellia Syndicate that once tore Mitsu from the sea, to where Caelios hides.

A tale of beasts and humans alike with a past they must learn from. The question is: would they?