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For other characters with the name "Hirasawa", see Hirasawa (disambiguation).
Ui Hirasawa
First Appearance
Manga Debut Volume 1, Chapter 2
Anime Debut Season 1, Episode 1: Disband the Club!
Other Appearances
Movies K-ON! Movie
Voice Provider
Japanese Madoka Yonezawa
English Xanthe Huynh
Korean Myeong Seon Lee
German Tabea Börner
Chinese Bo Qi Hui
Also Known As Ui-chan
Age 14-17
Birthday February 22, 1993
Class 1-2
Musical Profile
Role Rhythm Guitarist
Instrument Electric Guitar
Fender Japan '57 Reissue Stratocaster in Surf Green
Gender Female
Height 154 cm
Weight 50 kg
Hair Light Brown
Eyes Light Brown
Blood Type O

Ui Hirasawa (平沢(ひらさわ) (うい)) is Yui Hirasawa's younger sister who becomes the rhythm guitarist of the Light Music Club's band Wakaba Girls during her senior year of high school.


Ui is basically a more skilled, knowledgeable, mature, dependable, and younger version of Yui Hirasawa. Ui's parents are a lovey-dovey couple and are rarely home, so she does the household tasks in their stead. Initially, Ui is a third-year junior middle school student, but later she enters the same school as her older sister in high school. Unlike her older sister, Ui is mature, smart, responsible and handles household chores well. She has a great deal of love and respect for her older sister, striving to look after her even at the risk of her own health.[1] She has natural talent for playing the guitar[2], and became capable of playing with the rest of the Light Music Club band only after a few days of practice. Ui easily picks up hobbies and is very skilled at most things she does. Ui is actually considered as the ultimate groupie for her sister's band and supports them with all her heart. She also occasionally provides a narrative to the story. She is in the same class as Azusa and Jun and hangs out with them sometimes.

The differences between sisters is quickly seen in episode 3 when Tsumugi, Mio, and Ritsu meet Ui for the first time, and are quite surprised at how mature Ui is compared to Yui. This has been used on occasion to tease Yui, though it is obvious to the three that Ui and Yui love and care for each other. Ritsu at times envies that and more than once she and the others wished they had a sister like Ui. This is seen when Ritsu hears about how Ui took care of Yui at the end of the Christmas episode.

Like Yui, Ui is a fast learner, able to learn how to hit a homerun at a baseball center just from overhearing how to do it from a stranger. Her talent tends to make her the envy of others, particularly Jun and Azusa.

Sometimes, Ui teaches Yui how to play some parts of the guitar since Yui is terrible at reading sheet music. Despite being a year younger than Yui, she looks nearly identical to her when her hair is down. Once, she pretended to be Yui when her sister was sick but was found out because she did not know the nicknames Yui had given to the Light Music Club members. She also once pretended to be Yui in order to hug Azusa, but Azusa recognized her immediately.

She joins the Light Music Club along with Jun at the end of the series, becoming a guitarist like her sister.[3]


Ui's Appearance in Junior High School

Although Ui is nearly identical to Yui with her hair down, she wears her hair in a small ponytail. In the second season, there is a slight difference in the color of their hair (Ui's looks more copper-like).

Ui's Albums[]

Character Image Songs

K-ON! CISS Volume 6 Ui.jpg K-ON!! Character Image Songs Ui.jpg
K-ON! Character Image Song Series Vol. 6: Ui Hirasawa K-ON!! Character Image Songs: Ui Hirasawa


  1. K-on Chapter 40
  2. K-ON Season 1, episode 12
  3. "K-ON!" Highschool, Chapter 4