The official website for the anime adaptation of kakifly's four-panel manga K-On! has announced that the K-ON!! anime's characters will promote Japan's 2010 (Heisei 22) Census, which launches on October 1. The characters will serve as image characters for the census within Kyoto Prefecture.

The K-On! manga launched in 2007 in Houbunsha's Manga Time Kirara anthology. A television anime adaptation aired in 2009, followed by an April 2010 television anime sequel. The franchise has proven popular, propelling its fictional band to the #1 spot on the nation's music sales charts and spawning a video game. Alleged knock-offs have appeared in Taiwan, Denny's Japan, and Tokyo Zokei University's official website. (Inspired by the fan interest in the unintentional similarities in its earlier campaign, Denny's Japan launched an official K-ON!! dessert menu on July 20.) The original manga has been licensed in North America by Yen Press, while the anime adaptation has been licensed in North America by Bandai Entertainment.