"Kanno Aya, also known as Aya-chan, is a main character in the manga ""Yoru to Asa no Uta"". She is a high school student who is studying to become a singer. Aya-chan is portrayed as a shy and introverted person, often expressing her thoughts through her diary.

Aya-chan has been singing since she was a child, but her dream of becoming a singer became more solid after hearing the music of a famous Japanese artist named Sakura. Her admiration for Sakura led her to apply for a singing audition, but unfortunately, she was not selected.

Despite the setback, Aya-chan's determination to become a singer did not waver. She continued to practice singing, and with the help of her friend Yuu, she was eventually able to audition again and get accepted into a music agency.

Aya-chan's talent as a singer quickly became apparent to those around her. However, she struggled with stage fright and lacked confidence in herself and her abilities. Her journey through the music industry involves overcoming these obstacles and learning to believe in herself as a performer.

Throughout the manga, Aya-chan's character development is a central focus. She grows from a shy and uncertain teenager into a confident and successful singer. Her relationships with her friends, family and love interests also play a significant role in her personal growth.

Overall, Kanno Aya is a relatable and inspiring character in ""Yoru to Asa no Uta."" Her passion for music and determination to achieve her dreams make her a strong protagonist that readers can root for."