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... n the Human Realm.

In other words, the answer to Hint 1 would be the Demon Realm…… That would probably be where the sender of the letter is.

As for hint 2: “It’s not in the four directions.”, it was tucked in a book about the geography of the Demon Realm. The four directions are probably talking about the Northern, Southern, Eastern and Western Demon Realm, which should mean that it was in the Central Demon Realm.

However, the central part of the vast Demon Realm is quite large ...

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