k-on!!, k-on series, running, multiple girls, akiyama mio, glasses, tainaka ritsu, nakano azusa, hirasawa yui, brown hair, school uniform, 5girls, kotobuki tsumugi, black hair, sakuragaoka high school uniform, instrument case, long hair, extra, short hair, guitar case, brown eyes, couch, guitar, 6+girls, parody, bag