Koutetsu Tenshi Kurumi Zero
English title: Steel Angel Kurumi Zero
Japanese title: 鋼鉄天使くるみ零
Type: OVA
Source: Original
Episodes: 3
Status: Finished Airing
Aired: Apr 18, 2001 to Jun 20, 2001
Duration: 15 min per ep
Rating: R+ - Mild Nudity
Studios: OLM
Producers: m.o.e., Pony Canyon
Genres: Drama, Romance, Sci-Fi

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)