on a cold winter night, a poor girl, Mei, walks around selling toys while hungry. but no one buys them. if she doesn't sell the toys, her father will hit her... she was scared. at that time, a stranger appeared and not only bought a rotor but also gave her food. the kind man said, "well, can you tell me how to use it?". mei takes off her panties, and then shows him how to use the rotor herself...