All Purpose Cat Girl Nuku Nuku OVA

A scientist, his son, and an incomplete biotech-type android are sneaking away from the scientist's psychotic wife. Along the way, the son gets out of the Jeep to satisfy an urge of nature, and comes back with a cat. At this point, gunfire erupts around them, and they try to get away. They succeed, but the cat was killed by a stray bullet.

Sometime later, the son attends school with his "big sister" named Nuku Nuku. Yes, this is the android — who now looks like a cute girl — with the brain of the dead cat. Of course, things do not stay peaceful for long; the boy's mother wants him back! And so the fast-paced action comedy begins.