1girl, arms_behind_back, bikini, bikini_under_clothes, black_bikini, black_hair, breasts, closed_mouth, collarbone, from_below, jacket, kagawa_rin, looking_at_viewer, looking_down, navel, partially_unzipped, purple_jacket, short_hair, simple_background, small_breasts, smile, solo, soredemo_ayumu_wa_yosetekuru, swimsuit, thick_eyebrows, white_background, yamamoto_souichirou, zipper