This one breaks your brain in under an hour, and that's the appeal. One minute Hyoi and Ryoi are goofing off in cat form like a Saturday morning gag reel, the next the screen is full of tentacled demon plague eating their classmates, and the OVA never once acknowledges that those two things don't belong in the same story. The plot runs three threads at once that refuse to line up, and yet somebody on this crew clearly cared: there are genuinely well-composed shots buried in here, an actual idea behind the Dark Cat power system, and a real villain in the old master Jukokubo. That gap between the ambition and the execution is the whole reason people still trade this thing around. It gets named alongside Mars of Destruction and Skelter Heaven, except Dark Cat is the one where you can see what it wanted to be. Watch it with friends, loudly, once.
Hyoi and Ryoi are brothers cursed with an unusual gift: they can transform into cats at will. When a sinister force begins spreading through their school, leaving students in states of terror and despair, the brothers realize their shapeshifting abilities might be their only defense. The creature responsible is no ordinary threat, a writhing mass of supernatural horror that feeds on fear and grows stronger with each victim it claims. As bodies pile up and the infection spreads, the brothers confront a horrifying truth: the entity is connected to their past, specifically to Jukokubo, a former master who taught them their feline arts years ago. Now they must decide whether to embrace the darker aspects of their powers to fight back or risk losing everything they care about to a force that may be beyond their control. The line between hunter and hunted blurs as they race against time in this brutal supernatural thriller.