Okamura Tensai

In Tokyo, an impenetrable field known as "Hell's Gate" appeared ten years ago. At the same time, psychics who wield paranormal powers at the cost of their conscience also emerged. Hei is one of the most powerful of these psychic agents. Along with his blind associate, Yin, he works for one of the many rival agencies vying to unlock the mysteries of Hell's Gate. The manga follows Hei and Yin as they investigate how a Black Dandelion is giving Contractor-like powers to people who come in contact with it. Tells the storyline between the first and second seasons of the anime.

Ten years ago, the mysterious Hell’s Gate suddenly materialized in the middle of Tokyo, and the stars of the night sky were obscured in darkness. In their place, new stars emerged, each corresponding to an individual endowed with supernatural abilities. Devoid of emotion and conscience, these powerful killers have come to be known as Contractors. But most people know nothing of the Contractors in their midst, and high-schooler Kana Shinou is no exception. Still struggling to pick up the pieces after her father’s death last year, Kana has never troubled herself with the rumors about Hell’s Gate. That is, until she spots her father in the street one day. Determined to prove her father is still alive, Kana begins her search, but her mission is attracting some rather dangerous attention. Fortunately, she is rescued from the clutches of death by Hei, the most wanted Contractor in Tokyo. Though he is unsympathetic to her situation, Hei agrees to protect her as she searches for her father. But just how much should she trust the Contractor known as the Black Reaper? (Yen Press)