After her death, nearsighted, poverty‑stricken motel cleaner Vera boards the ghost cruise The Siren for a deadly "Happy Family Voyage". Having shattered her glasses, she mistakes the ruthless S‑Rank headless captain Dorian and A‑Rank drowned doll Ruby for her assigned husband and daughter. Armed with plain‑spoken kindness and survival wits, she bonds with the two bloodthirsty monsters, fighting to secure a real family and find a way off the cursed ship alive.