The battle is over, and they can go about their normal lives now... or so they thought. With no time to rejoice after miraculously saving Mirai from Beyond the Boundary, Mirai lost all her memories. Akihito, now a high school senior, starts to avoid Mirai thinking it’s for the better. Not aware of Akihito’s feelings, Mirai tries to get closer to Akihito. Then, someone who knows of Mirai appears in front of the two. With Akihito’s troubles in vain, Mirai once again sets forth on a battle that forces her to look within.
It all began quite suddenly. Akihito, who appears human but is actually half yomu with the power to quickly heal himself, sees a freshman girl who appears ready to jump from the school rooftop. The girl, Mirai, who has the ability to manipulate blood, which is unique even among members of the spirit world, continues to fight her isolation. Akihito decides at that moment to save Mirai, but disturbing events soon begin to unfold.
Devoted to her family’s rice-cake–making business and the high school baton club, Tamako is a little slow when it comes to love. She’s oblivious to her childhood friend Mochizo’s affections, even though all their friends know. With graduation closing in and Mochizo leaving for Tokyo, will Tamako realise her feelings and tell him in time?
Graduation draws near for Yui, Ritsu, Mio and Tsumugi, the four 3rd-year students of the Light Music Club. They, together with Azusa, decide to go on a post-graduation trip. Their destination, decided by Lot, is London!
K-ON! Live Concert: Let's Go! (けいおん！ライブイベント ～レッツゴー！～) 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.
