Zero no Tsukaima: Princesses no Rondo - Yuuwaku no Sunahama
Zero no Tsukaima: Princesses no Rondo - Yuuwaku no Sunahama, The Familiar of Zero: Rondo of the Princesses OVA, Zero no Tsukaima:
DVD beach episode of Zero no Tsukaima: Princesses no Rondo. Also known as episode #6.5.