Peropero Candy: You no Shou

The protagonist is an average guy. One day in the street I meet up a agent who introduces me into a H shop (Image Club). I'm unwilling because it may be coarse, but he confidently says to me that there's a pretty girl in the shop, so I change my mind and get in. Yes! A beautiful and nice girl named Candy welcomes me. From now on the story's simple. We talk familiarly for a while and take a H situation-play. From time to time I meet up a girl in the street who resembles Candy in appearance but she says she doesn't know me. Who is she?