The girls practice their swimming routine at Lancer's mansion for an upcoming contest, but Teddy's pranks ruin their outcome at the Swimming Gala. Angrily, the girls demand that Sweetheart uninvite Teddy from her upcoming birthday party, giving the choice "him or us". Not wanting to choose between them, Sweetheart calls the party off. To sort it all out Lancer tricks both Teddy and the girls into getting on his father's yacht, refusing to let them off until they sign a peace treaty and Lancer convinces them to put their differences aside for Sweetheart. Lancer then brings Sweetheart to his mansion, where everyone surprises her with the party. Episode Song: "An Unforgettable Party", sung by Sweetheart's friends.