Ningyo no Ouji-sama

From Storm in Heaven: In the future, a devastating war has forced mankind to take refuge under ground. While most of humanity is content, several people dream of the impossible–of seeing the sky. The Narise Corporation has been researching just how to do that, using a special robot, Ciel, who has the unique ability to conjure up images of the world above ground through his songs. However, when murder strikes the company, Ciel has to run away…but he won’t ever forget his promise to lead his friend to the sky.

Once upon a time, there was a mermaid: "I want to become human so I can fall in love" she said. When her wish was granted, the lower half of her body turned to foam and she became a human… MALE ♂!? This is the love story of a 30-year-old virgin man and a beautiful (male?) mermaid!

What circumstances might drive someone to create a clone that copies even their memories? A replacement so perfect that even the clone won't realize he's a clone? Nanako once took Louie up on his offer and had him create the perfect replica of herself; now she stays at his side, witness to the mericlones that he creates. Beyond the stories of the individuals he "saves", who exactly is this man playing god, and why does he do it?