The 4th installment of the popular series! This time, the debut is Ai Shimatani, an office lady working for a certain first-class company. She has a superb body in both looks and style, but she is shy when it comes to sex. She is too embarrassed to get off, and she can't even make a sound, so director Futamura Hitoshi teaches her about "real" sex. Her body sheds tears and cums from the play she has never experienced before.