A kid carries guilt he can't speak. The riverbank where he used to dig becomes a place where time moves differently, where a strange boy appears and vanishes like sediment settling. By the end, you realize the summer wasn't about fixing what broke, it was about learning that some things don't need to be repaired, only remembered.
Rintarou carries a secret that weighs on him: he's broken his father's cherished fossil and can't bring himself to confess. The guilt gnaws at him as summer stretches ahead, heavy and uncertain. One afternoon at the riverbank where he usually digs for fossils, he encounters Toshi, a boy who seems to exist slightly outside the ordinary world. Something about him feels different, untethered from the normal rules of things. What begins as a chance meeting becomes something more as the two spend their days uncovering layers of earth and stone together. Toshi moves through the world with an ease that both puzzles and comforts Rintarou, and slowly the summer takes on a dreamlike quality. Between the striated dirt and the gentle rhythm of their searches, something shifts. The guilt that once felt suffocating begins to transform into something else: understanding, acceptance, maybe even peace. This quiet film traces how small moments and unlikely friendships can rewrite the stories we tell ourselves about failure and forgiveness.