1girl, d, ahoge, armpits, bikini, black_bikini, blonde_hair, blue_eyes, hachimiya_meguru, hair_ornament, hairclip, idolmaster, idolmaster_shiny_colors, looking_at_viewer, low_twintails, navel, open_mouth, outstretched_arms, shark, shuiro_(frog-16), side-tie_bikini_bottom, smile, spread_arms, swimsuit, twintails