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)

Type: OVA
Rating: R - 17+ (violence & profanity)
Season: fall 1989
Status: Finished Airing
Read more: MyAnimeList (MAL)
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Tags: contemporary fantasy fantasy shoujo based on a manga manga super power earth japan asia drama present romance horror gore josei twins athletics