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