Kamisu Reina Series

She is my best friend—a member of the track-and-field club and in a different class, but we always go home together. She is my hateful nemesis—the murderer of my family. I won't forgive her and I will take revenge! She is my fellow partner—together, we fight against the humanoid energies to save the world. She is my... She is always smiling with an absurdly beautiful smile. What is she to you...? (Source: Baka-Tsuki)