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