Sekai ni Hitori, Zenzokusei Mahou no Tsukaite

Briefly about Sekai ni Hitori, Zenzokusei Mahou no Tsukaite manga:

After being hit by a car, Kiyama Zen’ichi, an ordinary office worker, finds himself in a so-called perfect world. However, an attribute-checking crystal reveals that he has “Black Attribute. And worst of all, he is a child of a demonic kind!