In a twisted story of co-dependence, two sisters are pitted against each other by a giant, abhorrent leech creature that uses its mind-controlling influence to puppeteer them from the inside out.

When Dakota tries to break off her toxic relationship with Axel, it starts transforming him into a monstrous creature. He gradually succumbs to the poison of the decaying relationship, becoming a creature with increased aggression, a touch that melts skin and worst of all, he's contagious.