Two kids chase a painting across Japan and find out the promise it holds was always about them. The romance doesn't announce itself, it builds in the quiet moments between train rides and shrine visits, in the way they recognize something familiar in a stranger. By the time fireworks light up the sky, you realize the movie spent its entire runtime convincing you that some people are meant to find each other, and that the search itself is the point.

Two Tokyo high school students who have never met find their lives linked by a mysterious painting of fireworks. As they try to trace where the artwork came from, the pair grow closer, and the trail points to the Nagaoka Fireworks Festival in Niigata, one of the three great fireworks displays in Japan. Tied to the painting is an enigmatic promise that binds the two of them to the past. With little time left and the festival drawing near, Makoto and Akira face a choice that will reshape their futures in this romance film.