Mankind is close to extinction. Toxins have all but wiped out the male population. The remaining fertile men are housed in manors where their seed is collected.
Lena Lee is a new collector with a rare pheromone believed to reignite human fertility. She's assigned a male who's predicted to be her perfect match.
Angelo, a clockwork butterfly maker, is held captive, his essence harvested daily by Lena. Over time, the couple begins to fall in love, something which is strictly prohibited. When their forbidden love is discovered, Lena is banished from the manor.
Torn apart by the duty that brought them together, Lena and Angelo must find a way back to each other. But even if Angelo manages to escape, he doesn't know where to find Lena. Will following the path of the clockwork butterfly lead him to his true love?
Content Warning: strong language, BDSM, and graphic sexual content, including m/f, f/f, and f/f/m sexual interaction