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Rhein (レイン rein), also known as Bleu (原初の青 burū, lit. "Primordial of Blue") is the blue Primordial and subordinate of fellow Primordial Guy Crimson. Guy was the one who gave Rhein her name.
- Her name has been said to originate from the English word "rain."
- Rhein's name was changed between the Web Novel and the Light Novel version. In the Web Novel version, her name was Hirari instead.