Adaptation of Kakifly's seinen yonkoma manga series K-ON!. Serialised in Manga Time Kirara magazine since 2007 (and in sister magazine Manga Time Kirara Carat since 2008).

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!