Hiro Koya, the stern, leather-clad sensei, supervises Nana1Japan's exotic training sessions. He watches, hard and approving, as she corrupts the young minds and bodies of her students. The schoolgirls, initially shy and innocent, blossom into wanton creatures, eager to please their teacher. They learn to kiss, to touch, to pleasure each other and themselves, all under the watchful eyes of their stern instructor.