Hikaru Kusakabe, a typical teenager immersed in music, parties, and rebellion, crosses paths with his classmate Rihito Sajou, a model student excelling in academics. Despite their contrasting natures, a chance encounter during a choir practice leads Kusakabe to assist Sajou, sparking a daily routine of shared training sessions. As their bond deepens, both boys navigate the complexities of high school's final year and the uncertainties of the future. Amidst this journey, they explore their budding emotions, providing mutual support and fostering personal growth in each other.