1girl, arms_behind_head, arms_up, azu_ankoowl, blush, breasts, earrings, goggles, goggles_around_neck, green_eyes, grey_hair, grin, idolmaster, idolmaster_shiny_colors, jewelry, looking_at_viewer, male_swimwear, navel, serizawa_asahi, short_hair, small_breasts, smile, solo, sports_bra, star_(symbol), star_earrings, stomach, swim_trunks, two_side_up, wading, water, wet, white_background, white_sports_bra, wristband