|Volume 1, Chapter 0|
|Volume||K-ON! Volume 1|
|Next Chapter||Volume 1, Chapter 1|
Volume 1, Chapter 0 is a bonus chapter of the first Volume of the K-ON! Manga by Kakifly. Unlike the other chapters, it was not published in Houbunsha's Manga Time Kirara magazine and is exclusive to the tankōbon volume instead.
Starting her high school career, Mio decides to join her school's Literature Club until she is stopped by her childhood friend, Ritsu, who wants to join the Light Music Club. Mio's objection is quickly rejected by Ritsu who simply rips the club application form in half before she drags her to the faculty office. Arrived there, they are informed by the music teacher Ms. Sawako Yamanaka that the club has no members left and becomes dissolved unless at least four students join by the end of the month.
Satisfied, Mio heads to join the Literature Club for real but is stopped by Ritsu once again who is thrilled by the idea of becoming the club's president if she joins it first. Eventually, another girl named Tsumugi shows up who would like to observe the Choir Club. Ritsu pushes her to join the Light Music Club instead but is stopped by Mio who prepares to leave the club once and for all.
On her way, Ritsu yells at her and reminds her at the old promise the two made, forming a band together. However, the short emotional moment is destroyed instantly by Ritsu again who starts to crack jokes about their earnings once they become professionals. The whole scene seems to be so funny for Tsumugi that she decides to join too. With already three members and the line-up of a drummer, a bassist and a keyboardist, Ritsu enthusiastically declares that all they need now is somebody who plays guitar.
At the same moment somewhere else, a girl named Yui Hirasawa looks up while sitting in front of her club application form.