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