I can see the lifespan of humans. When I was ten, my mother abandoned me, and my stepmother died in an accident. I even tried to save my only friend, Niwa, but he died too... That's how I became completely alone.

Even though I can see lifespans, I stopped caring by the time I reached high school. But then there's the only person who talks to an outcast like me. Guest. The class president and the only one who reaches out. Why is your lifespan... only 7 days?

....He stares at Guest who is surrounded by friends. Why you....