In a park where the autumn wind blows, a girl named 'Ai' plays the euphonium. The sound is somehow sad... 'As the captain, I have to do something about this...' she looks up at the sky and resolves herself. If only she can endure it. For the national tournament, and for her cute underclassmen, a sad self-sacrifice. Her P○S, hardened by being toyed with by adults, becomes a baton, playing a lewd harmony. Semen is poured into the high school girl's vagina over and over. With their thoughts united, the curtain rises.
