Mangas

Heuk Shin, Kurogami, Kuro Kami, Kurokami
Black God is about a computer programmer who meets a Mototsuitama (divine spirit) over a bowl of ramen and loses an arm because of it. He wakes up the next morning with the arm intact and discovers that every person has a doppleganger and some even have a triple liner.
フリージング ペアラブストーリーズ -  Freezing: Pair Love Stories
The Freezing Pair Love Stories manga tells the story of how the various Pandoras and Limiters met. The first chapter focuses on the characters Ganessa Roland and Arthur Crypton. > Spin-off of Freezing
Onihime
Weak, bullied, and pessimistic about life, thats Setsuna Kashiwagi. On the verge of jumping off a bridge, a mysterious man appears behind him and offers the contract 10 million yen in exchange for your life in a year. Skeptical at first, he accepts. Waking up the next morning, thinking it was just a dream, he notices 2 beautiful women sitting beside him. They are Kanna and Rena, Oni princesses here to claim his heart in a year.
幽灵王, 幽霊王, 유령왕, The Phantom King, Yuurei Oh, Yuurei Ou
11 years ago, Eun Sung-min was one of the few survivors from a village that experienced the "Evil Phenomenon". He and his maid were saved by the mysterious Phantom King and his group, Phantom. Now the Special Environmental Protection Agency is searching for the answers to what happened on that fateful day, and how to combat the "Evil Spirits" that caused such mayhem.
サイ:テイカー―二人のアルテミス―, Sai:Taker, Summon Assist Interface
In the future, an energy source called "Life" has become incredibly important. Certain people are able to synchronize with devices called "Sai" which gives them the ability to extract "Life" and have super powers. These people are known as "Sai Takers." Within the "Sai Takers" there is an even smaller group, "Original Takers." "Original Takers" have a contract with a magical device, and they can manipulate "Life" without the use of a "Sai." These powerful people are also immortal, and they only die if they run out of "Life." The world admires "Sai Takers," but "Original Takers" are careful to keep their identities secret.
Unbalance Unbalance, UnbalanceX2, UxU
A young man finds and returns a lost wallet and cell phone to a beautiful young lady, thus begins the destined relationship between two strangers. Sound typical? Well then, how about making the young lady the young mans future homeroom teacher, and give them both a twisted sense of right and wrong. And just for kicks, lets have the young man help himself to a self proclaimed reward from the lost wallet before returning it...but of course, this scenario would not be complete unless the young lady was very unforgiving when it came to teaching one of her students a lesson on morals.
제로 - 시작의관, ZERO 始まりの章, Zero - The Beginning, Zero - The Casket of Beginning, Zero - The Gate of Beginning, zero-始まりの館
Having been born in a secret government laboratory that cultivated esper (telepathic) powers within humans, Shuuichi and two sisters, Sumire and Katsumi, are forced to endure a difficult life as test subjects until their escape. Years later, these siblings are still being sought after by unknown organizations that are after Shuuichi powers as he is what they refer to as the "Zero-sample" with the ability to cause "Zero-shock" 
Gi Yuh is the leader of the strongest gang in his high school. He lives together with his younger sister, who seems to love him.When saving the beautiful Ha Na from a truck he instead gets injured and lies in coma for two weeks. During these two weeks he dives into a strange dreamworld and after his recovery he is not the same anymore. He regularly dreams about what seems to be a past him. To find out what happened to him he asked his teacher for help, who has friends, who deal with fortunetelling and supernatural powers. Here he finds the answer to his strange condition: He is supposed to be a "higher" ghost", who takes the position of a dead or soon-dying person.