aida takanobu, kikuchi makoto, idolmaster, idolmaster (classic), idolmaster 1, bad id, 00s, 1girl, :o, antenna hair, blush, competition swimsuit, covered navel, cowboy shot, embarrassed, female focus, from below, gluteal fold, goggles, goggles around neck, green eyes, hand on own hip, looking at viewer, looking down, one-piece swimsuit, open mouth, purple hair, purple one-piece swimsuit, single vertical stripe, solo, swimsuit, wet, wet clothes, wet swimsuit