Three friends, Joe, Eric, and Hung, with a passion for medieval role-playing games, drag Joe to a weekend of live-action role-playing (LARP) to cheer him up after a recent breakup. Eric, an enthusiastic participant who possesses a mysterious ancient spell book, decides to read from it to add more authenticity to their game. Unbeknownst to them, the incantation used by Eric is real and accidentally summons a succubus from the underworld. The creature begins wreaking havoc, mistaking their imaginative fantasy for reality.

Chaos ensues as the friends and fellow LARPers find themselves fighting for their lives against a very real and deadly threat. They must unite their fantasy skills and figure out how to send the succubus back before it claims more victims. The weekend shifts from being a fun escape into a perilous adventure where their camaraderie and bravery are tested to their limits. The group discovers that they have far more courage and resolve than they ever imagined, facing increasingly terrifying challenges in a bid to survive and save their fantasy world from turning into a grim reality.