A cat's brain in an android girl's body means the show operates on pure cartoon logic where the rules change every five minutes. Nuku Nuku treats ultraviolence and earnest family drama with the same deadpan commitment, which makes the whiplash genuinely funny. You're watching a 1992 OVA that swings between protecting a kid from his homicidal ex-wife and a cat doing cat things in a giant robot body, and it commits to both with zero irony.
Ryunosuke's beloved cat meets a tragic end, but his inventor father has an unconventional solution: transplant the cat's consciousness into an android body shaped like a girl. Nuku Nuku emerges as part sister, part bodyguard, equipped with superhuman strength and feline instincts sharp enough to handle any threat. She'll need every ounce of that power because Ryunosuke's mother has other plans for the family. Estranged from her ex-husband after their divorce, she's determined to kidnap both him and their son, motivated by twisted maternal affection for one and ruthless ambition for the other. She wants her brilliant ex-husband's genius weaponry for her weapons manufacturing empire, and she won't take no for an answer. What unfolds is a bizarre domestic warfare where a cat-brained android girl becomes the only thing standing between a fractured family and chaos. Nuku Nuku throws herself into increasingly absurd confrontations, her feline nature clashing hilariously with android logic. It's action-comedy that doesn't take itself seriously, balancing genuine heart with ridiculous sci-fi silliness that keeps the tone light even as the stakes get stranger.