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.
Yuta and Mana have become immortal by eating the flesh of a mermaid, and they wander across Japan together hoping to find some meaning in their existence, or even a way to undo it. On a train they meet Masato, a young boy traveling alone who appears frightened of his mother, Misa. After seeing her attack him with scissors, the two start looking into the pair and learn that Masato is not what he seems. Meanwhile, monstrous creatures have been showing up. This single-episode OVA blends drama, fantasy, horror and mystery.