AOMORI, JAPAN--At first glance, 17-year-old Misaki Nakajima seems like any other shy and submissive Japanese schoolgirl. She loves shopping, text messaging, and the color pink. But beneath her wholesome exterior lies a wicked secret: Misaki Nakajima is consumed by sexual fantasies involving sweaty, middle-aged American men. "I can't explain it," said Nakajima, dressed in a pleated miniskirt and pure white knee socks.