rikumoto yoshiyuki, hoshii miki, idolmaster, idolmaster (classic), idolmaster 1, 00s, 1girl, ahoge, armpits, arms up, bare shoulders, blush, bouncing breasts, bra, breasts, cleavage, closed eyes, closed mouth, collarbone, female focus, frown, large breasts, long hair, monochrome, motion lines, orange theme, simple background, solo, strapless, strapless bra, underwear, undressing, upper body, white background