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When Prince Siegfried spots a beautiful swan with a crown on its head, for some reason he feels compelled to follow it. He discovers that the swan is, in fact, a princess named Odette, who is under a wizard's curse that causes her to become a swan by day. The wizard, Rothbart, wants to keep Odette to himself, and the only thing that can break the spell on Odette is a man who truly loves her, with all his heart and soul... (Source: Anime News Network)