Chou Man'in ~ Binyuu Shimai Shanai Choukyou

The main character is a private detective. One day, he receives an offer, "Please give sex training to two girls.... If you are interested in it, please call me." He calls the client and promises to visit a specific place. And a beautiful girl appears there! He immediately decides to accept the offer.... [From [url=http://web.archive.org/web/20090108064551/http://www.erogeshop.com:80/product_info.php/products_id/1010518]ErogeShop[/url]]