The 4th installment of the popular series! The person who will make her debut this time is Ai Shimatani, an active office worker at a certain top-class company. Although she has the best looks and style, she is not good at sex. Director Hitoshi Futamura teaches her about ``real'' sex when she says she is too embarrassed to have sex or even make a sound. A body that sheds tears and cums in a play that has never been experienced before.