1girl arm_support bad_id bad_pixiv_id ball bandaid bandaid_on_knee bandaid_on_leg barefoot beachball bikini bracelet brown_eyes brown_hair crossed_ankles feet from_side full_body gotou_hisashi hair_ornament hairclip hand_on_own_knee hirasawa_yui jewelry k-on! knees_up navel open_mouth round_teeth side_ponytail sitting smile soles solo swimsuit teeth toes