Perverted mentor Ryu Enami gives hands-on instruction to athletic performer Aya Hamanaka, who toured uncensored sites within a year of debut, teaching nipple-orgasm sex that pleases men. First comes the performer-popular Spence breast-gland check, massaging from bottom to top and right to left. Inexperienced Aya does not quite understand, so veteran Ryu demonstrates climax through her remarkably pink nipples, losing herself in rolling them while the mesmerized student witnesses a genuine sensual heaven of sex and nipple pleasure.