A member of Section 4. Kunio has grey hair and dark eyes. He typically wears a suit.

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, and along with his blind associate, Yin, works for one of the many rival agencies vying to unlock the mysteries of Hell's Gate.
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(Source: Anime News Network)

Non-anime roles:  David Palmer in "24" (live-action TV series) (Japanese)

__Awards__:

- Best Male Supporting Vocal Performance in an Anime Television Series/OVA at 4th Annual BTVA Anime Dub Awards (Staff Choice)

A side story of Darker than BLACK, also known as Episode 26. A Contractor was killed and it was rumored that his corpse and possessions were buried under a Sakura tree. Hei and the others (including the Police) decide to investigate.

Taking place after the events of Darker than Black and replacing the events Ry&#363;sei no Gemini completely, Hei (BK201) and Yin return to Tokyo to investigate how a Black Dandelion is granting Contractor-like powers to people who come in contact with it.

Kunio Matsumoto