1girl, arms_at_sides, ass, back, bikini, black_hair, breasts, cowboy_shot, floral_print, from_behind, green_eyes, hair_over_shoulder, halterneck, honma_(honmatomohiro), looking_at_viewer, looking_back, medium_breasts, medium_hair, petals, shoulder_blades, side-tie_bikini_bottom, sideboob, sky, strap_gap, swimsuit, tougou_mimori, yuuki_yuuna_wa_yuusha_de_aru, yuuki_yuuna_wa_yuusha_de_aru:_hanayui_no_kirameki, yuusha_de_aru