"Aoi Nagisa is the main female protagonist in the Japanese manga ""Dear, Only You Don't Know!"". She is a third-year high school student who is outgoing, cheerful, and popular among her classmates. Aoi is a talented vocalist and dreams of becoming a singer in the future.

Despite her cheerful demeanor, Aoi has a complex past that she keeps hidden from others. She lost her mother when she was young and has a strained relationship with her father, who remarried and had a child with his new wife. Aoi feels neglected and unwanted by her father and struggles to come to terms with her mother's death.

Aoi's life changes when she meets Saku, the male protagonist of the story. Saku discovers Aoi's talent for singing and encourages her to pursue her dreams. Aoi is initially resistant to Saku's advances due to her emotional baggage, but eventually opens up to him and begins to develop romantic feelings for him.

As the story progresses, Aoi becomes more confident in herself and her abilities. She forms a band with Saku and their friends and begins performing at local events. Aoi also works through her emotional issues with her father and reaches a better understanding of their relationship.

Throughout the story, Aoi's name is mentioned frequently as she is a central character in the plot. Her lively personality and talent for singing make her a popular figure in her high school, and her relationship with Saku brings depth and emotional complexity to the story."