Nanling High School Brass Band. Since joining the club, Katagiri Chihaya has consistently secured the 1st trumpet position. However, a transfer student, Aikawa Hibiki, who was also the 1st trumpet at a prestigious brass band school, appears before her. Although assigned to the 2nd position, Katagiri finds herself drawn to Aikawa's personality, talent, and the way she enjoys playing in the band. For Aikawa, who is struggling with her future and her approach to music, Katagiri becomes an irreplaceable presence, harmonizing sincerely by her side. The last competition of high school life for Katagiri and her friends successfully advances to the prefectural tournament. However, within the club, opinions arise suggesting that Katagiri, not Aikawa, should be the 1st trumpet...?! A wildly popular youth ensemble drama originating from LINE Manga, the tumultuous second volume!