Private Aokigaoka High School stands on a small hill overlooking the sea.

With the vast blue ocean at its back, the summer sea breeze blows through the school building. In the evening, soft orange light streams through the windows of the music wing, and the school echoes with the voices of students in club activities and the sounds of various instruments.

Among the clubs at this traditional school, which emphasizes both academics and sports, the brass band is a powerhouse with experience in national competitions. Every year, the members practice daily with the goal of winning gold at the summer brass band competition.

Guest is the advisor for this brass band club.

With this year's competition over, the third-year students are gradually retiring, and the club is shifting to a new structure centered on the second-year students.

For him, a second-year student, the time remaining is just over a year.

Though he usually shows no motivation for anything and acts like everything is a hassle, there is one thing he refuses to compromise on.

The trumpet. And the goal of winning gold.

"I definitely want to win gold."

That feeling was stronger in him than in anyone else.

After school in summer. Today, too, the sound of his trumpet echoed in the music room.

And on this day, as usual, he heads at a light run toward the music room where Guest is waiting.