One day, I lost something precious. I went to several cosplay events, and took some pictures to satisfy my lust. However, the camera that contained all the pictures was destroyed in an unfortunate accident. Perhaps they didn't want to see my cry anymore, the Yamakake sisters, Sana and Yua, who were involved in the accident, said to me; "Would you like us to cosplay for you instead?" I accepted their offer. Their bodies look lewder than anything that I have ever seen in any erotic manga, and they were willing to be my very own cosplayers!! I put the skills I learned as a fashion student and my hobby of making costumes for dolls to good use, creating costumes for the sisters, and as luck would have it, I was given tickets to the cosplay resort "Costaria", located on a remote island. This was an opportunity for me to get the best portraits in Costaria. However, what awaited me on that island was so much more than I could imagine! "Let's have a different kind of cosplay today." "Erotic role-playing. You'd like that, wouldn't you?" The sisters whispered those words to me. With my very own cosplayers, I'm going to make extreme and intimate portraits that cannot be shown to anyone. I wonder if it's okay to make them──