Akira Tanaka hides loneliness and self-doubt behind bright smiles, while his classmate Riku Hayashi is cold and distant. Forced to work together, they share a quiet bond. Riku notices Akira’s hidden scars during a rainstorm but stays silent. As trust grows, Akira opens up, and Riku becomes his quiet anchor—until the truth about Akira’s self-harm forces Riku to choose how far he’ll go to protect him.