Fireworks

Norimichi Shimada and Nazuna Oikawa live in the town of Moshimo (Japanese for "if"). The students make a bet regarding whether the fireworks are either round or flat in the sky. After finding a small glass marble, Nazuna, Norimichi, and Yusuke compete in the swimming pool race. Yusuke wins and Nazuna asks him to go on a date. Nazuna packs a suitcase and plans to leave home. Yusuke bails on the date and Nazuna is taken home by her mother. Norimichi throws the marble, wishing for luck and causing it to rewind time. Back when the race occurred, Norimichi wins this time around and Nazuna asks him on a date. They head to the train station, but are caught once again by Nazuna's mother and her fiancé.