Mila is a cardboard design engineer. She is currently designing and constructing a cupcake catapult with her little sister, Ivy. However, things change when Ivy destroys their project, making cardboard confetti instead. Mila is devastated and wants nothing more to do with Ivy. Mila continues to engineer - alone. But something is missing. Maybe Ivy was making cardboard confetti for a reason. So how do sisters rebuild their relationship while engineering their next ultimate cardboard creation?