The Secret That's Past Its Expiration Date (Prince of Tennis, BG, Yukimura)

[Why do I still take up my pen to write down the endless remnants in this sunset sky?] [I keep wondering: what kind of love could stretch across the light-years of an entire life, crossing a lifetime just to give one thing?] [This summer, I found a tart fruit lying among the rainwater and rotting leaves.] [A secret that has expired, one that belonged to you alone.] Theme: