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In an ancient world where martial artists reign supreme, Unseong can only watch as his master is brutally beaten to death after a false accusation of practicing forbidden demonic arts. Even after a valiant fight, he fails to kill those responsible and faces his own end. But fate has other plans… Instead of taking his last breath, he awakens as a child, training to be an elite soldier of a demonic sect. Now Unseong must embrace the demonic arts and harness power in his ultimate quest for revenge.

Tegami Bachi (or Letter Bees) are couriers that deliver important letters and packages throughout the land of eternal dusk, Amber Ground. The story revolves around Lag Seeing, a young boy who was born on The Day of Flicker, 12 years ago when the man-made sun went down for unknown reasons. The manga follows his ambition to become a Letter Bee and how he follows the path of his idol Gauche Suede who suddenly went missing one day...