Mystery of Life, my life (Karma Akabane x OC

I don't remember anything... About me, about my life, anything but only that I have two souls inside me. One is my own, and the other is.... My twin sister... Whoever she is. It struck me as strange that I couldn't remember anything else but that, who was I before that? Who am I now? What am I? Am I one soul or two? I question myself everyday ever since I was released from the hospital. Not too long after, I went to Kunugigaoka, where I was transferred to the 'End Class', where the down graders were put and have a job to kill a yellow octopus. Here, is where my story began - where I acted like nothing mattered, but to me, everything mattered. Everything that happened, it was hard to understand. Feelings were hard to understand, what's this concept of love and hate everyone is talking about? And this red head keeps pestering me, me of all people, who knows nothing yet knows everything, english, math, geography, history, social studies, everything except for my own life. Then there's the octopus, who knows about my condition, tries to help me, and everyone else? They try to become my friends - difficult really when I always shy away, sleep the days or say nothing. Yeah, my life is quite the complication that's hard to solve.