Yami no Purple Eye
English name: Purple Eyes in the Dark
Genres: Horror, Mystery, Supernatural
Type: Music, Episodes: 1
Aired: 1987
Studio: J.C.Staff
Source: Manga
Rating: PG-13 - Teens 13 or older
Synopsis:
Based on a shoujo manga written and illustrated by Shinohara Chie serialised in Shoujo Comic.

The original story follows the struggles of a teenage girl after she finds herself turning into a lycanthropy-leopard and having to battle her newly found predatory instincts.

In 1987 an animated music video of 30 minutes length was made based on the award winning manga. 

(Source: AniDB)