D'Eon is a French nobleman bent on serving his Divine Majesty Louis the XIV to the best of his abilities, following in the footsteps of his beloved sister Lia de Beaumont. However, his straight-forward role with the secret police is interrupted by the sudden death of his sister while on a diplomatic mission in foreign lands. In his desire to find the truth of her murder, he comes before the King and becomes closely entwined in the mysterious organization known as Le Secret du Roi. He quickly finds himself embroiled in a realm of spiritual energy where death is a gate to greater powers and the Psalm of the King brings destruction in its wake. D'Eon must ask himself what is the price of truth and who will pay it, as the French Revolution looms inevitably nearer.
Though the time periods are different, both anime take place in a european setting. Both involve a small amount of history mized with supernatural occurances. The main thing that ties these two anime together, however, is the use of words as a weapon.
In the early 20th century, Kazuya transfers to a prestigious academy as part of an exchange program between Japan and Saubure, a small European country. But while Kazuya would love to make friends and have a typical school life, the boy is shunned by his ghost story-loving peers who believe that he's a "Black Reaper" to be feared. Things change one day when Kazuya wanders to the top of the library and discovers a lush botanical garden, and a beautiful, small, blonde-haired girl named Victorique who rarely leaves the building and is fascinated by unsolved mysteries. Together, the two develop a budding friendship and take on many chilling and dangerous cases that even the famous local detective Grevil can't solve.
Both GOSICK and Le Chevalier d'Eon are set in a historical era (Between World Wars and Revolutionary France respectively) and in French speaking countries (Fictional Sauville and France respectively). They both often take a dark tone while otherwise maintaining a light atmosphere. They both also blend gothic, European imagery with supernatural elements to create a very similar feel. GOSICK is lighter and less intense than the latter, however.
Guided by a star only they can see, a group of maidens known as HiMEs have begun to gather at Fuuka Academy. These young women have been endowed with dangerous supernatural powers that they can use to their heart's content, but there's a price: to wield them, they must put their most important thing on the line. Now, in the midst of school work and friendships, they find themselves caught in the midst of strange conspiracies seemingly related to the terrifying monsters that attack them. Is the power of the HiMEs strong enough to save themselves and the ones they love?
Characters are incomparable. Settings are changed. Plot pace is different. Yet there is one major detail they share; their treatment of the predurnatural.
Each manages to make the protagonists abilities blend in the series, without overwhelming its plot. Still beyond this, there is an element of mystery that will make you wonder even after the ending.
If you're looking for a clone, you'll find a lot of differences. But if you savor subtlety with your preternatural- you may have interest in both.
For the past five years Orphen has been on a journey to find the Sword of Baltanders and Bloody August, a feared dragon who was once a human sorceress named Azelie. With his partner Cleao and apprentice Majic, he now travels the perils of the land in search of a way to free Azelie from her evil imprisonment. With only a small trail of clues to follow, Orphen must unlock the secrets to the Sword of Baltanders or everyone he cares about will be doomed to face the wrath of the Tower of Fang Elders, or even Bloody August herself!
Both Le Chevalier d'Eon and Orphen deal with one man's quest of loyalty for a "sister" (related or non-related) and his search for vengeance on those who wronged said girl. Both series are set in a reality where magic, shady rulers, sorcerors and monsters are possible. If you like the world of Le Chevalier D'Eon, you'll love the world of Orphen.