Ayanokouji Remu is a very unusual young women. Despite her youthful appearance, she is actually a private investigator, and due to her usual abilities she can enter into other people's dreams. In the dream state she acts like a guardian angel, defending the dreamers from evil powers that lurk inside the spirit realm.

Source: ANN

Note: There exist two versions of the first episode. Originally it had sexual content (released on 10.06.1985), but due to high popularity, the next episodes were free of such content and released in the non-adult anime market. The first volume was later re-released as a "Special Version" with all the sexual content replaced with new footage, changed soundtrack and the voices were redone. The "Special Version" also contained a whole new episode.

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Sequel: New Dream Hunter Rem