Two immortals who ate mermaid flesh centuries ago show up at the wrong house on the wrong day, and what they find there makes eternal life feel like a curse worth breaking. The horror isn't supernatural, it's the kind that lives in a room between a mother and child, the kind that doesn't need fangs or blood to destroy someone. By the end of one episode, you understand why these two wanderers have been searching for a way to die for so long.
Centuries of immortality weigh heavy on Yuta and Mana. Bound together by the cursed flesh of a mermaid they consumed long ago, they drift from place to place searching for purpose in their endless lives. When they encounter a withdrawn boy named Masato and his mother Misa, something feels deeply wrong. The child's fear runs too deep, his obedience too absolute. As Yuta and Mana investigate the household's peculiar dynamics, they uncover a truth far darker than simple cruelty. Strange creatures begin stalking the area, their origins tied directly to the family's hidden past. What begins as curiosity transforms into something far more sinister as the immortals realize they've stumbled into a cycle of suffering that predates their own immortality. The question shifts from whether they can escape their curse to whether they should intervene in horrors that might be beyond their power to stop. This single episode sits at the intersection of personal anguish and supernatural terror, where immortal observers finally confront the limits of their detachment.