Ouka, head of Japan's Paranormal Phenomena Bureau of Measures, is no stranger to the strange and unusual. But his life takes an unexpected turn when he catches a young cat girl stealing apples in the commercial district. Thus begins OPERATION COZY FAMILY, a mission to bring together the potential offspring of Enka- the ancient God of Destruction who predicted humanity's downfall through its progeny. Working alongside his partner, Kyouka- ruler of a demon underworld, Ouka forms a makeshift family with a lion, jellyfish, oni, cross-dressing mafia heir, and bioweapon. Their challenge? Overcoming the chaotic family dynamic while fending off Enka's descendants.