Seikoku no Ryuu to Powder Kiss

Kei Asagiri is boy who has had part of his soul ripped apart a sent into the Netherworld. This allows him to use the mysterious power of black flames stronger than any other magic, but in exchange for the lost part of his soul which is constantly being eaten by the denizens of the other side. Kei works as an "Antique Hunter" for the Kaorun Company. One day when returning from a job to Koarun Academy City in Japan, he was kidnapped by a weird but very capable group and brought to the far side of ...