Custom Mate 3

It's Christmas. Hayashi Ryuusuke is walking through the crowded city, feeling sad that he is alone on such a day. Suddenly, he spots a neon sign: Custom Mate. He enters and sees a strange receptionist with elf-like ears and a magic symbol on the forehead. She creates the girl of his dreams and they get married! But this is just the beginning, and Ryuusuke realizes that marriage is not all about the honeymoon...

[From Moby Games]