Prism Ark

Prism Ark ~Prism Heart 2~ (プリズム・アーク 〜プリズム・ハート エピソード2〜, Purizumu Āku ~Purizumu Hāto Episōdo2~) is a Japanese erotic video game and the sequel of Prism Heart developed by Pajamas Soft. Its first release was on August 25, 2006. An anime entitled Prism Ark began airing on Chiba TV, on October 8, 2007.

Plot
The Sablum Empire has been attempting to take over the kingdom of Windland for many years, and are now plotting with the mercenaries Sister Hell and Darkness Knight to start a new offensive using powerful magical beings called Angels.

Hyaweh, a carefree yet talented swordsman, and Priecia, who just might be the lost princess of Windland, are enrolled at the Knight's Academy in Windland to hone their skill at swords and sorcery. There they meet many friends and allies who can help them protect their homeland from the impending invasion.