The Familiar of Zero: Rondo of the Princesses OVA
ゼロの使い魔 ~三美姫(プリンセッセ)の輪舞(ロンド)~ 誘惑の砂浜
1 sub eps
DVD beach episode of Zero no Tsukaima: Princesses no Rondo. Also known as episode #6.5.