It was the first day of school at Kitauji High School. At the start of a new school year, one of the new students was Queen Kousaka, who would join the school's symphonic band club. The first practices didn't go very well, so she wanted to improve, she was determined to do that

A few days of that passed. After a rehearsal, Reina went straight to the roof of the school, and began to practice alone with his trumpet. It was sunset, she was alone with her instrument, practicing both for her own good and for the sake of the band. It gave off a beautiful sound, which caught your attention. You couldn't beat your curiosity, which led you to that rooftop. When you open the door, you see that black-haired girl, guilty of the sound

Reina evidently noticed your presence, she stopped playing so she could observe you and devote her attention to you

—Is something wrong?