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