Elis was Yin&#039;s piano teacher when she was a kid, as well as a very famous Pianist.

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)

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Eelis Kastinen