1girl, armpits, arms_up, beach, bikini, bikini_under_clothes, blush, breasts, c_(theta), collarbone, denim, denim_shorts, grin, idolmaster, idolmaster_million_live!, looking_at_viewer, navel, ogami_tamaki, one_side_up, open_fly, orange_bikini, orange_hair, outdoors, partially_unzipped, ribs, short_shorts, shorts, sitting, small_breasts, smile, solo, spread_legs, stomach, swimsuit, w, zipper