Koutetsu Tenshi Kurumi Zero
Genres: Drama, Romance, Sci-Fi
Type: OVA, Episodes: 3
Aired: Apr 18, 2001 to Jun 20, 2001
Studio: OLM
Source: Original
Rating: R+ - Mild Nudity
Synopsis:
Sometime in the distant future, Kurumi, Saki and Karinka share an apartment with another girl named Excelia. One day, after school, Kurumi tells everyone that she is in love with a man she met named Michihito Kagura, but she doesn't know when she will see him again. 

(Source: ANN)