Princess Knight is a fast-paced tale of a heroic princess who can beat any man at fencing, yet is delicate and graceful enough to catch the eye of Prince Charming.
A mischief-making angel’s prank goes too far when the newborn princess of Silverland ends up with two hearts—one male and one female. Since the laws of Silverland only allow a male heir to ascend the throne, Princess Sapphire is raised as a prince. But will the avaricious Duke Duralumin discover Sapphire’s true nature and snatch the crown for his own son?

Not to be confused with the original 1953 serialization from Shojo Club, this version (serialized in Nakayoshi from 1963-1966) was completely redone from the ground up to coincide with the anime adaptation, and remains the most famous version of the manga.