aru (arudes), akagi miria, idolmaster, idolmaster cinderella girls, highres, 1girl, black hair, blue one-piece swimsuit, blush, brown eyes, brown hair, covered navel, flat chest, gluteal fold, hair bobbles, hair ornament, multiple girls, name tag, old school swimsuit, one-piece swimsuit, one eye closed, open mouth, pear-shaped figure, petite, school swimsuit, shiny skin, short hair, smile, solo, standing, swimsuit, thigh gap, wide hips