From Lovely Strange Dark:
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?

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!

(Source: 200 wpm)

In Tokyo, hidden in a small street, you can find a charming and peaceful place called Wakusei Drops. In this place, you can find a general store, a coffee and a clairvoyance room, held by three teenagers that will not let you go without a smile on your face.

From Tokyopop:
Yuuki is an energetic teenager who carries the disturbing power of foresight in her dreams. She finds that this is tied to the mysterious Deep Sleep that has overtaken her sister, Yuuka.
Clues left on her cell phone and visions that come to her in her dreams begin to reveal a strange puzzle... and then in one dream, a glass wall stands between her and her sister while a faceless little girl stands by Yuuka. The mysterious girl hands Yuuki a kaleidoscope--which Yuuki discovers she still has when she awakens from the dream the next morning

Hiromu is a high school boy who has everything he could ever want: a normal life, friends, and a girlfriend. That is until one day Hiromu asks everyone where Tetsuya is and no one knows. All of his classmates think he is crazy for insisting that this Tetsuya person exists since no one has heard of him. Then on his way home from school Hiromu finally meets a boy who remembers Tetsuya and says that Tetsuya was "delicious" and this isn't the only strange occurrence. This boy seems to think that Hiromu's name is Glorious Lily and that his lover is not his girlfriend, but a beautiful, emotionless girl named Valeriana. With the help of this mysterious boy Hiromu uncovers his past, who Valeriana is and who, or what, he is.

Yamada Hana's just moved to Tokyo, and her perfect debut falls disastrously flat. Not only do things at school start off bad, but her demon sister's sold her off to work for Haru, who seems to spend way too much time touching girls. If that weren't enough, Haru's gorgeous, and Hana has a strange condition where she breaks out in hives whenever cute guys touch her! (taken from Storm in Heaven).

[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.