Yesterday I started my final exams for college and what a coincidence that the cute girls from K-On are taking their mid term exams in this week's episode.
Instead of studying, Yui practice some new chords that she was asked to learn and goofs off. Everyone in the club except for Yui pass with a great score. Yui got a 12 out 100, Epic Fail to the max.
We later learn that anyone who failed the midterm is banned from all club activities until they take the make up exam. If they fail the make up exam, then they are kicked out from their club, this is the bad because without Yui, the light music will be abolished(you need at least 4 members to have a club).
Yui has about a week before the exam and to no surprise, she spend most of that week playing guitar, cleaning her clean, and not studying. On the day before the exam, she asks her great friends to help her study. Each girl had their own job, Mio was tutor, Tsumugi was the cake supplier, and Ritsu did nothing. We finally get a chance to meet Ui, Yui's younger and mature sister.
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