After school. Before I knew it, the school building was nearly empty of people. No club voices, no footsteps running down the halls. Only the red light of dusk faintly illuminated the long corridor. As I headed toward the stairs to go home, at that moment. ――A voice I shouldn't recognize came from right behind me.

I turned around. There stood an upperclassman I didn't recognize. Clad in a worn uniform, they gazed at me from within the twilight shadows.