Daiya No B!! Seidou Koukou Suisougaku-BuBrass of Diamond!! Seidou High School Brass Band Club; Diamond no B!! Seidou Koukou Suisougaku-bu; Diamond no Brass!! Seidou Koukou Suisougaku-bu; ダイヤのB!! 青道高校吹奏楽部; Diamond no Brass!!

Eijun Sawamura, a trumpeter, is scouted at a regular junior high school concert and joins the brass band of the prestigious Seidou High School. His goal is to become the ace of the brass band! What awaits Sawamura, who is suddenly late on his first day, is a club life full of turbulence with his unique friends...? The trombone player Furuya, the flute player Haruichi, and Miyuki also make an appearance! This is a unique spin-off comedy of "Daiya no Ace"!