Chihaya Ayase has spent most of her life supporting her sister’s model career. When she meets a boy named Arata Wataya, he thinks Chihaya has potential to become a great karuta player. As Chihaya dreams of becoming Japan's best karuta player, she is soon separated from her karuta playing friends. Now in high school, Chihaya still plays karuta in the hope that she will one day meet her friends again.

Yui Hirasawa has no clue which club to join, but she’s determined to do something this year. As luck would have it, she discovers a flyer for the Light Music Club and decides this is the club for her. But there's one problem: She first must learn guitar!

The story revolves around Shu Ouma, a high school boy who inadvertently obtains an ability called "The Power of the Kings" that enables him to draw out items called "Voids" from other people. He is then thrown into the conflict between a resistance group called Funeral Parlor which aims to restore Japan's independence from a quasi-governmental organization known as the GHQ. In the process, Shu has to deal with the burden his ability puts on his shoulders and the horrific mystery of his past.

With graduation right around the corner, every member of the Light Music Club except for Azusa will be leaving for good. But the girls aren’t going to let something as silly as graduation tear them apart! For their final hurrah, the girls are going on the ultimate vacation tour— all the way to London! Their overseas journey will lead them on a trip of discovery and friendship as they take the stage one last time for their final encore together.

K-ON! Live Concert: Come With Me!! is a live concert held in Saitama Super Arena on February 20, 2009. A concert dedicated to all the K-ON! fans from each of the seiyuu of the characters. There are a total 9 seiyuu attending the event, including Aki Toyosaki (Yui's seiyuu), Yoko Hikasa (Mio's seiyuu), Satomi Sato (Ritsu's seiyuu), Minako Kotobuki (Tsumugi's seiyuu), Ayana Taketatsu (Azusa's seiyuu), Asami Sanada (Ms. Sawako's seiyuu), Madoka Yonezawa (Ui's seiyuu), Chika Fujito (Nodoka's seiyuu) and Yoriko Nagata (Jun's seiyuu). This concert has been attended by more that 17 thousand fans and a CD, DVD and Blu-Ray copy has been sold throughout Japan.

"K-ON! Live Concert: Let's Go!" is a live concert held in Yokohama on December 30, 2009. A concert dedicated to all the K-ON! fans from each of the seiyuu of the characters. There are a total 8 seiyuu attending the event, including Aki Toyosaki (Yui's seiyuu), Yōko Hikasa (Mio's seiyuu), Satomi Satō (Ritsu's seiyuu), Minako Kotobuki (Tsumugi's seiyuu), Ayana Taketatsu (Azusa's seiyuu), Asami Sanada (Ms. Sawako's seiyuu), Madoka Yonezawa (Ui's seiyuu) and Chika Fujitō (Nodoka's seiyuu). This concert has been attended by more that 17 thousand fans and a CD, DVD and Blu-Ray copy has been sold throughout Japan.