Kirigaya Ryugamine is an unassuming high school boy with a hidden gift for drawing, preferring to pour his emotions into his art rather than expose himself to judgment. His quiet life begins to change when he meets Kiryuin Shiina, a confident and composed girl who seems to have it all-but harbors a distance that no one can bridge. Through a chance meeting at the riverside and shared work at a part-time library job, the two form an unlikely bond, one that grows into something deeper, though neither dares to say it aloud. As high school begins, Kiryuin starts to change. Her once-assured demeanor shifts unexpectedly-at times warm and familiar, and at others distant, almost like a stranger. Kirigaya notices her growing avoidance of him and her peculiar interactions with a boy from their past, one she claims not to know yet later engages with as though they share a complicated history. Unable to comprehend the changes in her behavior, Kirigaya is drawn into a web of uncertainty. He wrestles with questions that have no answers: What is Kiryuin hiding? Why does her mood shift so drastically? And what is her connection to the boy who suddenly reappears in her life? As Kirigaya searches for the truth, he finds himself sketching the moments they once shared, hoping his art will hold the fragments of a love he fears may never be whole. In the quiet of spring, at the riverside where it all began, a bittersweet farewell awaits-a moment where love, mystery, and the weight of unspoken words converge.