In 1775 during the Spanish colonial period in the Philippines, nuns attempts to survive the night after an unknown evil was set free in their cloister. Meanwhile in 2025, a group of friends attend a Halloween masquerade ball which was attacked by a serial killer. Fast forward to the future in 2050, a post-apocalytic Philippines is ruled by the aswang.

Part of Shake, Rattle & Roll Evil Origins. In 2050, a post-apocalyptic Philippines is ruled by the aswang.

The long-awaited Cosme family gathering takes an emotional turn when Bing surprises everyone with the announcement of her upcoming marriage. Hurt that their only sister kept such a major decision from them, her brothers, still guided by their late father Kevin's wish to protect her, puts Bing's fiancé through a series of challenges to test if he is truly worthy of becoming part of the family. Meanwhile, Azon, quietly carries her own emotional burden as she wants to reunite with her beloved Kevin after years of holding on to his memory. Amid their personal struggles, the Cosmes are shaken by the threat of their community's demolition.