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Background
Ui and Yui during a past christmas.
Ui was born one year after her older sister Yui Hirasawa and grew up with her together, developing a strong affection to her which was returned equally. One Christmas in the past, she wished for a "White Christmas" which was granted the next day by Yui who stuffed a bush in front of their house with the foam of a pillow, earning Yui heavy scolding from their father. Since their parents often travel across the world, Ui got used to filling the role of the household's caretaker and constantly looked after her older sister. Eventually, she became friends with Nodoka Manabe who often visited Yui at home and also built a friendly connection to their neighbor Tomi Ichimonji. After graduating from elementary school, she started visiting the same school Yui and Nodoka attended and became friends with her schoolmate, Jun Suzuki.
Ui watches her sister rushing towards her new school.
On the first day of Yui's high school career, Ui wakes her sister up. Yui got the time wrong and starts rushing towards her new school, leaving a confused Ui behind.
Ui first appears when she greets her older sister's friends from the Light Music Club, Mio, Ritsu and Tsumugi to their home, with the three girls noting how Ui is more mature than her own sister.
She later gives her sister and her friends some snacks while they help with Yui's studies. When Ritsu is told to go outside of the room due to her messing around, she plays video games with Ui to pass the time, with Ui always being the winner.
