yanpooru, osaki tenka, idolmaster, idolmaster shiny colors, highres, 1girl, arms behind back, artist name, bdsm, black socks, bondage, bound, bound ankles, bound arms, bound legs, breasts, brown hair, brown sweater, chair, cleave gag, cloth gag, desk, from above, full body, gag, gagged, grey skirt, improvised gag, long hair, long sleeves, looking at viewer, miniskirt, on chair, plaid clothes, plaid skirt, rope, school chair, school desk, shoes, sitting, skirt, sneakers, socks, solo, sweater, white shoes, yellow eyes