1girl, air_bubble, anastasia_(idolmaster), bare_shoulders, bikini, blue_eyes, bracelet, breasts, bubble, crop_top, curled_fingers, detached_sleeves, fingernails, frilled_tankini, hair_between_eyes, holding, holding_water_gun, idolmaster, idolmaster_cinderella_girls, jewelry, long_sleeves, looking_at_viewer, lying, medium_breasts, motoki_(hisano_motoki), on_side, open_mouth, ponytail, short_hair, short_ponytail, smile, solo, starfish, swimsuit, tankini, water, water_gun, white_hair