Ui and Yui grew up together in a close-knit household, with Ui often taking on the role of the responsible sibling due to Yui’s carefree and whimsical nature. From a young age, Ui displayed a natural talent for taking care of others and managing daily responsibilities, which made her a key figure in supporting Yui through school and club activities.

Despite her nonchalant demeanor, Ui looks up to Yui and is deeply inspired by her sister’s passion for music and her dedication to the Light Music Club. This admiration eventually leads Ui to pick up the guitar and join the Light Music Club in her senior year, forming the Wakaba Girls along with Azusa Nakano and other new members.

Ui has short, straight brown hair that she usually wears down, along with soft brown eyes that resemble her sister’s. Her clean and tidy appearance reflects her responsible and composed personality. She typically wears her school uniform neatly, in contrast to Yui’s more relaxed approach.

Ui is mature, caring, and responsible, often acting as the “parental figure” in her relationship with Yui. She is patient and nurturing, always looking out for her sister and ensuring she stays on track with her responsibilities. Ui’s dependable nature makes her well-loved by her peers, who often rely on her for support.

Although Ui is generally calm and composed, she has a playful side, especially when interacting with Yui and her friends. Her kindness and willingness to help others are some of her most endearing traits, making her an invaluable presence in both her family and the Light Music Club.

• Support for Yui and the Light Music Club
  Ui plays a significant role in supporting Yui throughout her journey with the Light Music Club, often stepping in to remind her of deadlines, assist with practice, or help her prepare for performances. Her encouragement and unwavering support allow Yui to thrive as a musician.

• Joining the Light Music Club
  In her senior year of high school, Ui decides to formally join the Light Music Club, becoming the rhythm guitarist for the Wakaba Girls. Her natural talent for music allows her to pick up the guitar quickly, and her dedication helps maintain the legacy of the club after the original members graduate.

• Relationship with Azusa and Wakaba Girls
  Ui shares a close bond with Azusa Nakano, whom she admires for her leadership and musical skills. Together, they work to keep the spirit of the Light Music Club alive through the Wakaba Girls, fostering a new generation of musicians at Sakuragaoka High School.