Fushigi no Umi no Nadia Specials
Fushigi no Umi no Nadia Omakes
Nadia: Secret of Blue Water Specials
ふしぎの海のナディア
While Nadia has been licensed by ADV, the Omake "extra" episodes were not. These short Omake "extra" episodes were included as a bonus on the Japanese LD set. They were never released on any other format.
(Source: AnimeSuki)