2girls, bikini, bikini_top_only, black_bikini, black_hair, breasts, choker, cleavage, collared_shirt, detached_sleeves, eye_contact, halterneck, idolmaster, idolmaster_shiny_colors, interspecies, jichi, long_hair, looking_at_another, medium_breasts, mermaid, monster_girl, monsterification, multiple_girls, navel, open_mouth, overalls, pants, pool, purple_hair, red_eyes, red_pants, shirase_sakuya, shirt, short_hair, sideways_mouth, smile, swimsuit, tanaka_mamimi, twintails, underwear, white_shirt, yuri