[Machine Translation] A shocking sci-fi mystery action anime by Bones & Tensai Okamura! Volume 3 on DVD. Tokyo has lost its true "sky" due to the appearance of the "Hell's Gate," an anomalous realm that cannot be analyzed. In response, people with special abilities appear. In exchange for their abilities, they have lost their human-like emotions and even kill people in cold blood, and people call them "contractors" with awe. The intelligence agencies of various countries are waging a fierce espionage war over the mysteries hidden in the gate, using the "Contractors". The main character, Hei, is a Chinese student, Li Shunsheng, who blends in quietly in the city of Tokyo, but behind his back, he is a skilled fighter in the dark side of the battle, and is called the "Black Reaper" in BK201 due to the awe-inspiring way he carries out his missions. He is a first-class agent of the organization, and is feared by the intelligence agencies of various countries for his unpredictable abilities and his ability to fight against enemy contractors. He encounters women with sad pasts, and then they part. The conflict over the "Gate" intensifies as the Public Security Department's Foreign Affairs Division 4 pursues the case of the "Contractors"... Contains episodes 6 to 8.