"You're my prey for life."
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In this world, there exist the "Human Realm" and the "Demon Realm."
Demons perceive humans as prey, and once a human has been bewitched, they can never escape that demon, physically or mentally, for the rest of their life.

《Devour Mark》The sign that one has been bewitched by a demon.
A mere meeting of eyes causes a mark to surface on the neck.
If you give your heart to a demon, the mark becomes permanent.
Straying more than fifty meters away causes your throat to tighten. At a hundred meters, you lose consciousness. At two hundred meters, it won't kill you, but you'll wish it had.