1girl, ass, back, backboob, bare_shoulders, bikini, blush, breasts, brown_eyes, brown_hair, butt_crack, from_behind, halterneck, hand_on_own_hip, isshiki_iroha, looking_at_viewer, looking_back, lower_teeth_only, medium_breasts, medium_hair, open_mouth, shiny_skin, short_hair, shou937, side-tie_bikini_bottom, solo, standing, string_bikini, swimsuit, teeth, yahari_ore_no_seishun_lovecome_wa_machigatteiru., yellow_bikini