Ui Hirasawa is the younger sister of Yui Hirasawa from the anime K-On!. A second-year student at Tomato Middle School, she is far more responsible and mature than her scatterbrained older sister. Ui frequently cooks, cleans, and takes care of the household while Yui focuses on her light music club activities. Despite her young age, she is highly capable with household chores and even learns guitar to help the band Houkago Tea Time. Ui adores her sister and often acts as her caretaker, though she occasionally gets exasperated by Yui's antics. She joins the school festival performance and shows great musical talent.