K-ON!! Season 2 episode #9
Yui and her friends have to take their final exams in their school.
Yui studies hard for her final exams, but also promises her old neighbor Tomi Ichimonji that she'll perform a guitar solo in a local talent show, which is the day after finals. Seeing how determined Yui is to do well at both, Azusa offers to help by turning the solo into a duo—YuiAzu, and drawing up a strict study schedule for Yui.