Black Rock Shooter

Ok, I somewhat recently fell upon this as I was browsing YouTube. It's a Japanese OVA (or Original Video Animation) by Ordet studios in Japan. It's based on a song by Supercell and it's music video. The video is around 50 minutes long, but someone on YouTube kindly broke it down into 10-12 min segments, and there are 4 parts of the movie like that, but it depends on who's version you watch.
The whole movie is about a girl named Mato and another girl named Yomi who meet on their first day of Junior high. They become best friends, and they both join a sport. Mato chooses Basketball while Yomi chooses Volleyball, but they both practice at the same time in the gym. They spend a lot of time together, but then their second year of Junior High starts and they get split. They both have different classes, and start hanging out less. Yomi becomes jealous of Mato as she starts hanging out with the basketball manager named Yuu. (I probably should've mentioned this earlier, but it is an all girl school).
Then, one day, Yomi doesn't show up at school. Mato worries, but thinks nothing of it. Then she receives news that Yomi has been reported missing, and is questioned by two detectives about her whereabouts. Mato soon becomes depressed, and sends Yomi texts, but Yomi never answers. This goes on for about a week before she does receive a text from Yomi. Mato freaks out, but it's blank. This causes Mato to rush to their favorite place, but all she finds is the phone charm that she gave her. It starts to glow, and transports her to another place, where she bonds with Black Rock Shooter to save Yomi, who has been possessed by Dead Master, who wields a giant scythe and controls two Skull minions. Black Rock Shooter is armed with an arm cannon that fires 20 rounds per second and a fiery blue left eye. It shows the battle that takes place between the two, but it's throughout the episode. In the end, Mato saves Yomi, but then Yuu starts acting strange. The End.
I really enjoyed the anime, but just to forewarn you, the thing is spoken only in Japanese. English subtitles, but Japanese voices.

LINK!!!
http://www.youtube.com/watch?v=dWnnA93RL8k&feature=mfu_in_order&list=UL
(This says episode 1 part 1, but it's only 1 episode, so why put that there?)