K-On!

In an unspecified part of Japan, four high school girls join the light music club of the all-girls private Sakuragaoka High School to try to save it from being disbanded. However, they are the only members of the club. At first, Yui Hirasawa has no experience playing musical instruments or reading sheet music, but she eventually becomes an excellent guitar player. From then on, Yui, along with bassist Mio Akiyama, drummer Ritsu Tainaka, and keyboardist Tsumugi Kotobuki spend their school days practicing, performing, and hanging out together.

The club is overseen by music teacher Sawako Yamanaka who eventually becomes their homeroom teacher as well, during their final year of high school. In their second year, the club welcomes another guitarist, underclassman Azusa Nakano. After Azusa joins they gain more structure and begin to practice more.

The first manga volume of K-On! was the 30th highest-selling manga volume in Japan for the week of April 27 and May 3, 2009, having sold over 26,500 volumes that week. The following week, the first and second manga volumes were the 19th and 20th highest-selling manga volumes in Japan, having sold 23,200 and 22,500 volumes each the week of May 4 and May 10, 2009. By May 2009, the first two manga volumes each sold about 136,000 copies each. The third volume sold over 120,000 copies the week of December 14–20, 2009, and became the 46th top-selling manga in the first half of 2010 in Japan (ending May 23), selling over 328,000 copies.

The single for the first anime's opening theme, "Cagayake! Girls", debuted at fourth in the ranking on the Oricon weekly singles chart, selling approximately 62,000 copies. The ending theme "Don't Say 'Lazy'" debuted at second in the ranking, selling 67,000 copies. It was also awarded Best Theme Song at the 2009 (14th) Animation Kobe Awards.