A medical professional has a lifelike, anatomically-correct medical dummy, with muscles as well as organs noticeable through its clear skin, named Pin (after Pinocchio). Via ventriloquism, Pin describes bodily functions in a manner kids can relate to. When the over-strict medical professional and his other half are eliminated in a car crash, his boy (Leon) transfers his alter-ego into Pin, whom he always thought lived. He begins making use of Pin as a reason to over-protect his sibling (Ursula) from admirers and also deflect undesirable intrusions, also to the extent of devoting murder.