Tenshi Dei leads an uneventful school life, until Haruo Hibiki, a former orchestra conductor appears. Haruo was once kicked out of his orchestra. He has the chance to return if he can establish an all-male "Boys Choir Club" at Kawagoe Academy and clinch a victory at the "National Contest." Tenshi and others are dragged into the Choir Club by and gradually become deeply immersed in the choir.