Disclaimer: Black Rock Shooter and Ao No Exorcist is not mine. (If I did there would already be a crossover manga and anime ^w^)

Rin Okumura's POV

Three months. That's how long she's been gone. The length of how long I haven't been allowed to hold her. Her pale skin and dark hair out of my reach, even though I can see her through the glass window, laying on the pure white hospital bed, an IV connected to her arm as her heart rate is monitored. I watched as Yukio spoke with a nurse at the foot of her bed, the voices inaudible through the glass. Why? I didn't understand it! She always healed so quickly with even the most fatal of injuries. Black rock Shooter, an undefeatable soul, taken down… and it's all my fault.

Ever since she appeared in the Vatican one day, the exorcists of True Cross knew that she could be used in their favor. She was defined as an excellent weapon with the ability to see all demons, even without ever having a tempaint. She was an otherself, from a whole other world, with the ability to heal almost instantaneously after being injured. Though a girl of so few words, her actions spoke for her. Reacting to only instinct, she would think of almost anything that moved as a threat. It did take a few months to control her and gain her trust, but the goal of making her an "undefeatable tank" against demons was accomplished.

It was true that she had no emotions once she came, but as time passed, her eyes seemed to change. The once expressionless girl had shown sadness, not anger or neutral, in her eyes, and no matter how many times people stared at her right in the face, it went unnoticed. I had noticed about a week after it began, knowing those eyes as once my own, eyes of loneliness. Every time I saw her in the cram school, usually for training with Shura, I had attempted to ask her what was wrong, but the only response I got was silence.

I would watch her each day as she would be avoided by the other students, too afraid to approach the girl, knowing that there was the chance of having a giant cannon pointed at your face, with no way to save yourself if you spoke with her the wrong way. Apparently the wrong way was speaking to her all together, that being the reason for the constant fear of the dark blue haired girl with the strange eyes.

"Hey, Rock!" I called out to her one afternoon as I caught her walking out of Shura's office. She looked in my direction with the same eyes as always, lonely and sad. I quickly walked over to her as she stood in wait, head now looking toward the floor. "Hey, Rock. How's it going? How was training with Shura?" A simple silence was my answer, but she didn't walk away. All she did was look up to my face, then look back down and lean her shoulder against the wall.

She jumped as I put my hand on her shoulder and turn her back to face me, a face full of seriousness. "Black Rock Shooter. I know you're supposed to be this silent assassin in training for the Vatican, but I also know that you aren't as… emotionless as you used to be. I can see it in your eyes." This caught her attention, a slight brush of anger crossing her now slightly squinting eyes, using her hand to push mine off her shoulder as she turned around and heading the opposite direction she originally was headed in. "Hey!" I yelled after her. "All I'm trying to do is help!"

What happened next I don't think I was prepared for. A blue spark ignited as she turned around, her left eye now ablaze with a wavering blue flame. "I don't need your help." She said silently, the blue flame flickering out as she turned her back once again and walked away, leaving me alone in the hall.

"Oi, Rin. What do you think you just saw?" This time, I was the one turning around, Shura glaring at me with her arms crossed across her chest. "Sh-shura…" I managed to sputter out in shock of what hat just happened, the two tone haired woman coming to drape her arm over my shoulder and lead me into her office. She sat me down in a chair in front of her desk, as she sat behind it. "It isn't what you think, Rin." "I-Isn't what I think?!" I stammered, stuttering a bit to try and regain control of my thoughts. "Rock's eye is- Black Rock Shooter is-… is she my sister?!" I had to restrain myself from standing up and walking out as Shura laughed at my accusation. "Like I said, Rin, it's not what you think," her voice dropped to a whisper. "That flame of hers is indeed one of Satan's, but she is not a child of Satan." Confusion overtook me. "If she isn't a spawn of Satan then what is she-" "Like you know, she's an otherself from the 'otherworld', but what you don't know is that the devil himself created the otherworld."

A hand waved in front of my face. "Helloooo? Rin? You still here?" Shura's hand hit against the top of my head repeatedly, trying to bring me back to reality. "So… Black Rock Shooter is actually a demon?" Shura nodded, a saddened look now crossing her face. "In a way she is. But in a way, she isn't." Once again, I was left confused. "You exorcists in training are never taught about the otherworld because human contact was never supposed to be made with it. Unfortunately, contact is sometimes made, and last year was a major occurrence. A girl by the name of Mato Kuroi passed into the otherworld, causing her otherself to lose control, and release the demonic form of what Satan first meant to create to otherworld for. That otherself was Black Rock Shooter."

Speechless. All I could be was speechless. Rock? A demonic otherself? No way! She wouldn't do that! "And you're positive it was her?"

"100 percent."

I slumped down in the chair and sat in thought. A question finally came to mind. "So that's why she has that flame?" "No. She's had it much longer, her being the only one to possess the strength that Satan intended for the otherworld. But that's how she got here. The exorcists removed her from the otherworld to stop her from injuring her human counterpart, Mato Kuroi, any more than she already had. The purpose of the otherworld was to protect the humans whose emotions grew too strong for them to control themselves. Originally it was caused to induce pain to those whose emotions had gone overboard, to 'end their suffering'. After Satan met yer mother, he changed the purpose to begin the process of having demons and humans living together." More thinking. If Rock was a demonic force in the otherworld, then why did she look so sad now? As if Shura read my mind, she continued her explanation. "Her eyes have changed, and I know you've noticed. Yes, otherselves are supposed to be emotionless, but ever since Black Rock Shooter was removed from the otherword, she had felt detached from Mato, her life source. She's been training with me to start supporting her own life, and not partially relying on Mato's emotions. She has also been experiencing fits of anger, what you just saw, her 'insane' side now released."

The more I learned, the more I realized Rock's story was, in ways, just like mine. She possessed a power that was taken negatively by the exorcists, and had to hide it from everyone. She was a demon being used as a weapon of True Cross, and had to take the time to learn how to control the darker side of her. "Shura? Do you think you could help me talk to Black Rock Shooter? Her life, in just a few ways, reminds me of mine. I want to help her, 'cause I know she can't do it alone. If she can relate to someone, maybe-" "Fine, fine. Just stop yer yammerin', will ya?" I smiled and stood up, pushing in the chair as I headed for the door. "Thanks Shura!"

"That's Miss Kiragakure to you!"

I stood up as Yukio walked out the door to Rock's hospital room, quickly walking over to him. "How is she?" I asked, panic clear in my voice, yet all Yukio did was walk right around me. I sighed, taking it as a bad sign, my head turning back to the glass window and the sleeping girl behind it. I closed my eyes and reached out to touch the viewing pane, putting my palm against it, somehow hoping that I could reach her from here. Even though I knew it wasn't possible, I continued my effort, feeling a slight spark run across my hand as it lit. Maybe if I just try a little harder, I can be with you… My thoughts trailed out as a hand rested on my shoulder. "Nii-san. Visiting hours are closing. We have to go home." A sigh escaped from my mouth, knowing that Yukio was right, and I wouldn't be allowed back in if I broke the rules, so there was no other option.

On the walk back to our current residence to the dorm rooms, I noticed Yukio looking much more worried than usual, his eyes making direct contact with the ground, and his head tilted to a degree where you could no longer see his face. "The doctors are trying their best-" His voice cut off, as if the words were stuck in his throat. "And they say there is nothing that can be done to wake her up." My fists clenched even tighter than before, using them to shove past Yukio and run ahead to the dorms. "Nii-san!"

I had reached our quarters at least ten minutes before Yukio, allowing me time to sit at the table and hold my head in my hands, tears slowly leaking down my face. "She isn't dead, but she might as well be," I whispered through my sobs, feeling a furry presence rub at my leg. Rin, you don't really mean that, do you? I put the side of my head down on the table, trying to pull myself together, my sadness making me forget that Kuro had been waiting for us. I shook my head back and forth, knowing that I would never wish death upon a single one of my friends, especially Rock. Silently, tears ran down my face as the two tailed cat jumped onto the table, rubbing my head with his own. I'm sorry, Rin. It'll be okay… "No, Kuro… It won't… It never will be."

Under my breath I made a silent promise to the girl in the hospital, swearing that no matter how long it took, I would wake her up. "I'm so sorry, Black Rock Shooter."

Black Rock Shooter's POV

Pain. I remember pain. And blue. So much blue. It made me almost want to hate the color, even though it was the color I was bound to. And tears. Someone was crying. Their sobs had awoken me… They seemed so distant, but so, familiar, as if I had heard the sound more than once. The image of it was so fuzzy, and hardly recognizable, that it made me want to just open my eyes and try and comfort the person to the best of my ability. It could be Mato… Maybe she needed me. No, the cries were more masculine, and held more emotion that I as an otherself could understand… I knew those cries… I needed to help him… The connection between us wasn't the one I had with Mato, bound to one another without a choice, but I wanted to be with this person. I needed to… Do you need me?

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Rin?

So this was my first story I seriously posted on the internet. I enjoyed writing it and I hope you enjoy reading it! I'm sorry if any of the characters are OOC, and I would really appreciate reviews and favorites if you liked the story! Thank you, and another chapter is coming soon!