pu-en, akiyama mio, hirasawa yui, kotobuki tsumugi, tainaka ritsu, k-on!, 00s, 4girls, arms behind back, black eyes, black hair, blonde hair, blue one-piece swimsuit, blush, breasts, brown eyes, brown hair, cloud, collarbone, competition school swimsuit, embarrassed, hairband, ho-kago tea time, leaning forward, long hair, looking at breasts, multiple girls, one-piece swimsuit, open mouth, own hands together, parted lips, ponytail, school swimsuit, short hair, sky, small breasts, sparkle, summer, swimsuit, teeth, towel, towel around neck