According to the official website, the volume 6 of "Umi Monogatari ~Anata ga Itekureta Koto~" DVD includes an extra episode. It will be released on March 26th, 2010.
Short extra episodes "Marin no Kore Naani?" will also be released from the volume 2 to be released on November 22nd.
Source: official website
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Anime