1girl ahoge areola_slip armpits beach bikini blue_bikini blush breasts brown_hair c_(theta) cleavage collarbone foreshortening heart highres idolmaster idolmaster_million_live! looking_at_viewer medium_breasts navel o-ring o-ring_bikini outdoors ponytail selfie side-tie_bikini_bottom sidelocks signature skindentation smile solo swimsuit tokoro_megumi w