"Ang Kasambahay" is a chilling Pinoy horror animation that tells the story of Lina, a young woman who takes a job as a live-in maid for a wealthy family in a grand but old mansion. At first, everything seems normal—Lina is tasked with household chores and caring for the elderly matriarch, Doña Clara, who is bedridden and frail. However, as the days go by, Lina begins to notice strange occurrences in the house—doors creaking open by themselves, faint whispers at night, and cold drafts in certain rooms.

One night, Lina hears footsteps in the hallway but finds no one there. The other servants are quick to dismiss her fears, warning her not to ask too many questions. Lina becomes increasingly uneasy, especially when she learns that the mansion has a dark history. Decades ago, a former kasambahay mysteriously disappeared, and rumors say her restless spirit still roams the halls, seeking revenge for an untold injustice.

As Lina investigates, she uncovers horrifying secrets about Doña Clara and the family’s past, including a connection to the missing kasambahay. The ghost of the former maid begins to torment Lina, seeking justice and forcing her to confront the dark truths hidden within the mansion's walls. Now, Lina must survive the ghost's wrath and escape before she becomes the next victim.

"Ang Kasambahay" blends suspense and supernatural horror, exploring themes of betrayal, vengeance, and the haunting power of unresolved secrets. The animation creates a tense and eerie atmosphere, drawing on Filipino beliefs about restless spirits and the consequences of wrongdoing.