Kira Kira is an eroge, or hentai game. The story revolves around Shikanosuke, the story's male protagonist, and his female partners, Kirari, Sarina and Chie. All four attend the Christian high school Ohbi Gakuen, and are the only four members of the Daini Bungeibu (Second Literary Club). Their club was about to be disbanded when the group decides to form a rock band called the Daini Bungeibu Bando, or d2b, for short. In order to make it an all girl band, Shikanosuke dresses in drag and goes by the name of Shikako. After the quartet's popular school festival performance was broadcast on the internet, the group goes on to perform throughout Japan. In the game, the player takes on Shikanosuke's role and, as with any eroge, your answers determine which lady, if any, will sleep with you.

This particular sketch was drawn at Anime Expo 2009 when Katakura appeared at the MangaGamer booth. I believe that, similar to other artists that appeared at the booth in 2010, Katakura did not have much experience drawing the characters on paper. There's quite a bit of improvement from Katakura's 2009 drawings when compared to his 2010 creations.

Here's a clip from the "Kira Kira Rock 'n' Roll Show" game for the PS2.