The story is taken from the famous Nordic saga, but is based on the adaption of Richard Wagner: Der Ring des Nibelungen, a cycle of four epic music dramas.

Central element of the story is of course the stunning Ring of the Nibelung, guarded in the depths of the sea by the nymphs of the water. According to the legend, the owner of the ring will get an enormous power that can challenge even the gods.
The hero of the manga is Siegfried, who grew up in the woods with the blacksmith Mime (a dwarf), and is accustomed to harsh life and fighting. He embarks on his destined journey when Mime is killed by a soldier and he is out to get revenge. On his journey he will meet Woden, the god of thunder, and his daughter Brunilde, with whom he falls in love.

The story begins in Regensburg, Germany in 1903. There is a rumor at the all boy's Catholic S. Sebastian Music Institute that if someone looks through a window in one of the towers known as The Window of Orpheus and sees a beautiful girl through it that they will fall in love with her. This love will only bring pain for it will end up like the tragic Greek myth of Orpheus and Eurydice.
Two of the students - Klaus and Isaac see a girl through the window. Not realizing that she is fellow student, Julius, who was raised to be a boy, things spin out of control and their lives are changed forever. -Wikipedia

From Lililicious:
A classic manga about girls at a private all-girls school. The storyline centers around the experiences of Nanako, a "normal" girl who is invited to join the prestigious school organization, the Sorority, and is resented by all the other students because she doesn't appear to be qualified. Other key characters are Nanako's two friends: Tomoko, her friend since childhood who is alienated by Nanako's decision to try to join the Sorority, and Mariko, a strange, obsessive girl who is invited to join the Sorority along with Nanako; her "older brother," Henmi, who she corresponds with by mail; and the "Three Magnificent Ones," all of whom are admired and quasi-worshipped by the rest of the student body: the head of the Sorority, Miya-sama, the haunted, pill-popping rebel, Saint Juste, and the star athlete with a mysterious disease who doesn't like the Sorority, Kaoru-no-kimi.

The Rose of Versailles focuses on Oscar Fran?ois de Jarjayes, a girl raised as a man to become her father's successor as leader of the Palace Guards. A brilliant combatant with a strong sense of justice, Oscar is proud of the life she leads, but becomes torn between class loyalty and her desire to help the impoverished as revolution brews among the oppressed lower class. Also important to the story are her conflicting desires to live life as both a militant and a regular woman as well as her relationships with Marie Antoinette, Count Axel von Fersen, and servant and best friend André Grandier.

Licensed versions of this manga have been published in French, German and Spanish.

In front of a mansion where roses blossom, Tomoko and her brother Kenichiro meet a mysterious girl. She looks interested in them but vanish each time they see her.

(Source: MU)

Claudine is a woman convinced since she was young that she was born into the wrong gender. She struggles through life, being the first child after three older brothers to take after their father. She wants only to be able to find true love...

In the 18th century, The Polish-Lithuanian Commonwealth was an elective monarchy, in which the king was elected by the nobility. The kingdom thrived under its unprecedented in the history of Europe, yet flawed democratic political system. Many difficult trials stand in front of this freedom-loving country. Will democracy yield to tyrrany? Read "Ten no Hate Made" to find out! Created by the author of world famous "Lady Oscar" (Versailles no Bara) - Riyoko Ikeda - this gripping historical story of war, love and deceit is certainly worth reading!