Ten years ago, an inscrutable and abnormal territory known as Hell's Gate appeared in Tokyo and altered the sky and wreaked havoc on the landscape. The heavenly bodies disappeared, replaced by false stars. During this time, people who possess various special abilities emerged. Kept secret from the knowledge of the masses, these individuals, known as Contractors, are able to murder in cold blood. Various nations around the world use Contractors as spies and agents, often resulting in violent battles for information. Each fake star has a corresponding contractor, and they vibrate when their contractor's power is being used. As such, contractors are usually identified by their star's Messier catalogue number. However, their abilities are gained at the edge of their humanity. They are implied to lack human emotions which includes no aversions to murder, and they are regarded as extremely rational and logical in their decision making. Contractors are thus named because of their need to always complete a remuneration or payment each time their power is used (ie. eating flowers, breaking fingers, drinking blood). Contractors usually work for one of various rival Organizations as spies and assassins.

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