SAI:Taker: Futari no Artemis

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 ...