An ordinary Japanese high school student takes home an abandoned supernatural cat left in a cardboard box. Maybe he shouldn't have meddled with kitties beyond human comprehension—after all, it had tentacles where its whiskers should have been! But it's too late! --- With no Elder Sign on the cat door, soon the pick of the Mythos litter starts to invade his house, as furry and feline versions of Hastur, Yog-Sothoth, Nyarlathotep, and other adorable Lovecraftian horrors blast his mind, whisper impossible secrets, and generally get underfoot!