Mio and Ritsu are childhood friends, but the latter could not remember how they first met. In elementary school, Ritsu often picked on Mio due to Mio being very shy, as well as left-handed and having silky black hair, among other things. Mio was depressed because of her shyness, so Ritsu encouraged Mio to imagine the audience as pineapples, which allowed Mio to get over her stage fright. Since then, the two have been best friends despite having very different personalities.
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Ritsu also clings onto Mio like a lifeline when it comes to studies, and claims that Mio is the best tutor she has ever met. There have been times when Mio clings onto Ritsu instead; when Mio was being bullied by Sawako or other people, Mio would come running to Ritsu hoping she would save her from distress although sometimes Ritsu joins in the bullying too. They both also have a similar interest in photography, as Ritsu always brings a digital camera with her, and Mio brings a film camera around. Ritsu was also the one who introduced music to Mio, and encouraged her to learn bass.
It was serialized in Houbunsha 's monthly seinen manga magazine Manga Time Kirara between the May and October issues. The manga is licensed in North America by Yen Press. A spin-off manga about a different band of high school girls, K-On!