Umi no Yami, Tsuki no Kage
Ruka and Rumi Kobayakawa are twin sisters in love with the same man, athletic upperclassman Katsuyuki Touma. Rumi seems supportive of Ruka′s fledgling romance with Katsuyuki, until the twins are infected with a strange bacterium that transforms Rumi′s personality and gifts the twins with terrifying psychic powers. Now Rumi will stop at nothing - or no one, that gets between her and Katsuyuki, including her own twin sister...
(Source: ANN)
Also known as: Darkness of the Sea, Shadow of the Moon, 海の闇、月の影, Umi-Yami
You should watch
Fushigi no Umi no Nadia Omake
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)
Hoshi no Umi no Amuri
The 3D modeled anime is set in Year 019 of the Insonity Progressive Revolution - a future era in which mankind has evolved into a new species called Adapters. Three very young Adapter girls from Japan, China and France set out on a space adventure...
Umi no Triton
5000 years ago, the Triton Family was living peacefully in Atlantis until the Poseidon Family destroyed them all. Triton, of the Triton Family line, embarks on an adventurous life in the sea fighting the Poseidon Family.
(Source: AnimeNfo)
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