S.D. Codified Laws § 15-30-3

The Supreme Court on appeal from an order granting a new trial, or upon a review of an order denying a new trial in the action in which such motion was made, or on appeal from the judgment, may order and direct judgment to be entered in favor of the party who was entitled to have such verdict directed in his or its favor, whenever it shall appear from the testimony that the party was entitled to have such motion granted.