Two kids meet near a floodgate after school. Yu is a shy 17 year old girl who sits down next to Yosuke as he plays his guitar. Yosuke recently gave up playing sports and has devoted himself to playing the guitar. He only plays a few lines over and over, as he tries to make a song from what he feels. Their relationship progresses tentatively as they both have difficulty in expressing their feelings and thoughts. One day Yu takes the initiative and kisses Yosuke. Yosuke responds by picking up his guitar and going home. Years later Yu wonders, "Why did I cry? Why didn't I stop crying? Why?"..while Yosuke wonders "Why did I run away from you that time?"