One Summer day, in a sea-side town. One Junior high school is gathered with an excitement before a firework show. Norimichi (Masaki Suda) and Yusuke (Mamoru Miyano), at a pool side, meets Nazuna (Suzu Hirose), an idol of their class, a girl they both secretly have a crush on. The two boys turn out to have a swimming match with Nazuna. Norimichi, although fails the match, finds a mysterious ball in the water. On the other hand, Yusuke, who won the fight, is asked by Nazuna to go out to watch the firework show together. After school, while boys have an argument whether fireworks are round or flat when viewed from sideways, Norimichi is told by Nazuna that she was going to ask out the one who won the swimming match. However, her true purpose was something else."If only I won the match thay day…"Irritated, Norimichi throws the ball he found in the water and then… When the fireworks sparkle, the love encounters a miracle.