"Okui Aina is a main character in the Japanese manga ""Falling Blue"". As a young high school student, she is described as being intelligent, thoughtful, and introverted. Despite her shy demeanor, she possesses a strong will and determination that serves her well throughout the story.

Aina's character is defined by her passion for music. She is a talented singer and songwriter, and spends much of her free time composing songs and performing at local venues. As an aspiring musician, Aina is constantly pushing herself to improve her craft, even when faced with setbacks or criticism from others.

While Aina is often seen as the voice of reason among her classmates, she struggles with her own personal demons throughout the story. Her parents' divorce and subsequent estrangement from her father has left her emotionally scarred, and she grapples with feelings of abandonment and loneliness. However, Aina's experiences have also given her a unique perspective on life, enabling her to connect with others in a profound and meaningful way.

Throughout the story, Aina develops several close relationships with her classmates and music peers, including the protagonist, Kojima Yuuta. Despite initial reservations and misunderstandings, Aina and Yuuta form a deep bond through their shared love of music and mutual respect for one another. Aina's influence on Yuuta serves as a driving force in his growth throughout the story, and the two characters become instrumental in each other's personal journeys.

Overall, Okui Aina is a well-rounded and complex character in ""Falling Blue"". Her passion for music, resilience in the face of adversity, and capacity for empathy make her both relatable and inspiring to readers."