Umi no Yami, Tsuki no Kage
English name: Darkness of the Sea, Shadow of the Moon
Genres: Drama, Horror, Romance
Type: OVA, Episodes: 3
Aired: Oct 14, 1989
Studio: Visual 80
Source: Manga
Rating: R - 17+ (violence & profanity)
Synopsis:
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)