During summer, Norimichi Shimada and his friends ponder the shape of fireworks from different angles. Their quest for answers leads them to the Moshimo Festival's fireworks showcase. Yet, Norimichi faces a dilemma when his classmate, Nazuna Oikawa, proposes eloping and seeks his companionship. As their escape plan takes a chaotic turn, a mysterious orb under Nazuna's care offers them a shot at unity once more.