Once referred to as New York City, Hellsalem's Lot is now a sanctuary for supernatural beings such as super-fast primates, blood-sucking vampires, and conversing fishmen, all of whom live in harmony with humans. Unfortunately, the unveiling of a gateway to The Beyond has trapped citizens from both realms within an impenetrable dome. To ensure order remains in this pandemonium, Libra, an assemblage of unorthodox individuals and superhumans, step up to safeguard the megalopolis and inhibit turbulence from expanding to other parts of the world. Leonardo Watch leads a mundane existence with his household and indulges in photography as a pastime. Moreover, after receiving the "All-seeing Eyes of the Gods" at the expense of his sister's vision, he journeys to Hellsalem's Lot to procure answers. Here, he stumbles upon Libra and unexpectedly becomes a member, exposing him to a world beyond his most outlandish imagination. Leonardo's voyage alongside his peculiar companions introduces him to a life he never knew existed in Kekkai Sensen.