k-on!!, k-on series, kotobuki tsumugi, sakuragaoka high school uniform, multiple girls, hirasawa yui, tainaka ritsu, school uniform, 3girls, blonde hair, brown hair, short hair, long hair, parody, couch, winter uniform, pantyhose, hairband, table, indoors, akiyama mio, hair ornament, jacket, skirt, socks, hairclip