1940, Paris. Marion is the leader of a group of street rats who steal to survive. A man hears her singing and invites her to play the role of Jeanne d'Arc in a play. The story of one woman's journey in the shadow of World War II.

Akira Kousaka was a lecturer for Tokyo Art University. Ever since he read about the Imperial Eggs, he wanted to visit Prussia to look at it with his own eyes. Finally with the winter break, he was able to go to Irina Art Museum in Prussia where the Imperial Eggs were displayed. Little did he knew that just by triggering the alarm system, his life would forever be changed with a single encounter.

Many years after the goddess Aigis brought an end to the battle between humans and demons, the prince of Logres, descendant of the hero, was living a peaceful life. On one such day, his fiancée, the eastern princess Kaguya, came to him. But before they had time to worry about discussing marriage, demons appeared, and the royal capital was seized in the face of their might. The prince and his allies narrowly escape with Kaguya, and decide to retake the capital. (Source: Harem-Battle)