In a world where forming a contract with spirits is strictly forbidden, Zayn, a man who has grown weary of life, decides to take on one final mission, intending it to be his last.
But fate has other plans. During the mission, Zayn unexpectedly forms a contract with a spirit.
The terms are simple: Zayn will gain the spirit’s power, but in return, he must open a door when the time comes, no matter what lies behind it.