Nozomi Kasaki/Relationships

Mizore Yoroizuka
Nozomi and Mizore became very close friends in middle school that they even joined Kitauji's concert band together, determined to aim for gold, but Mizore felt that their friendship fell apart after the Kitauji High School Concert Band Schism. Nevertheless, they managed to clear their doubts and misunderstanding in episode 4 of season 2. In the film

Liz and the Blue Bird, their relationship further develops, albeit in an arguably platonic manner. Nozomi promises Mizore that she'll get over her jealousy, and that they'll both support each other in their own terms. It is heavily implied at the very last scene that she finally reciprocates Mizore's feelings.

Natsuki Nakagawa
Nozomi is the person that Natsuki admires (similar to how Kumiko sees Reina) and Nozomi is one of the reasons why Natsuki decided to join the band in high school. Natsuki is shown to act very defensively of her, as seen when she tries to ask Kumiko where Asuka is.

Yuuko Yoshikawa
Yuuko and Nozomi grew to be good friends over time, and Yuuko eventually appoints Nozomi to be the band's accountant. However, due to her nature, Yuuko has snapped at Nozomi due to her antics with Mizore.

Asuka Tanaka
Nozomi and Natsuki decided that Asuka should be the person who decides whether Nozomi will be allowed into the band, and Nozomi will not join without her word. Asuka was very apprehensive of her return, but said it wasn't her place to decide. Asuka reasons that Nozomi makes Mizore Yoroizuka uncomfortable, and as she is the bands only oboist, her loss would be detrimental. Asuka also explained that Nozomi was responsible for causing the great number of second years to leave, and she wasn't interested in any more drama she had to offer. Eventually, once issues were cleared up between Nozomi and Mizore, Asuka tolerated Nozomi.

Kumiko Oumae
Nozomi frequently bumped into Kumiko and the two developed a friendship. Nozomi referred to her as the "euphonium girl" before learning her name. Kumiko served as a kind of mediator between her and Asuka.