A surgeon discovers his patient isn't sick, she's a messenger from another era warning him the demons are already here. He doesn't get to refuse. Time travel becomes the only operating table that matters. This OVA trades coherence for pure visceral momentum, throwing you into a war across centuries without waiting for you to understand the rules. The premise is audacious enough that even when the plot frays, you're too committed to the chaos to care. It's 1991 excess unfiltered: a one-shot that swings for the fences and doesn't blink when it misses.

A surgeon named Ukyo Rettsu treats a mysterious old woman for what is described as a strange cancer. The growth proves to be no illness at all: it is a messenger from Japan's ancient past, bringing warning that demons are about to invade the Earth. To stop them, Ukyo must travel back in time and fight that ancient demonic race himself. The story is a single action OVA from 1991.