k-on!, akiyama mio, hirasawa yui, tainaka ritsu, kotobuki tsumugi, horiguchi yukiko, ueno chiyoko, scan, 3:2 aspect ratio, photoshop, nude filter, 4girls, barefoot, beach, black eyes, black hair, blonde, blue eyes, bra, breasts, brown eyes, brown hair, cleavage, feet, female, group, hairband, headband, long hair, multiple girls, nipples, nude, ocean, short hair, tree, underwear, vagina, very long hair, water