kuroishi ringo, kangoku gakuen, liquid (company), game cg, 1girl, 2boys, bdsm, black hair, blush, bondage, bound, bound arms, bound legs, breasts, breasts apart, chalkboard, classroom, desk, female focus, hair ornament, hair ribbon, indoors, large breasts, long hair, looking down, lying, multiple boys, navel, nipples, no bra, on back, on desk, open mouth, outstretched arms, panties, purple eyes, ribbon, sitting, spread arms, spread legs, strap, topless female, underwear