Fireworks, Should We See It from the Side or the Bottom? (light novel)

On the eve of a fireworks festival in a quiet port town, a young boy wonders with his childhood friend what fireworks look like from the side. Their curiosity drives them to make a promise that they'll climb a light house and find out for sure. But that evening, the girl he secretly likes suddenly asks him to run away with her. Where will this summer night lead him.