Koutetsu Tenshi Kurumi Zero
Japanese title: 鋼鉄天使くるみ零
Type: OVA
Episodes: 3
Source: Original
Genres: Drama, Romance, Sci-Fi
Studios: OLM
Producers: m.o.e., Pony Canyon
Duration: 15 min per ep
Rating: R+ - Mild Nudity

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)