Eien no Aselia
English name: The Eternal Aseria
Genres: Adventure, Drama, Fantasy
Type: OVA, Episodes: 2
Aired: Jun 24, 2005 to Mar 24, 2006
Studio: Studio Matrix
Source: Visual novel
Rating: PG-13 - Teens 13 or older
Synopsis:
Yuto Takamine and his younger sister-in-law Kaori, were at their parents' grave, when they were suddenly summoned into another world, Phantasmagoria. The King and a woman named Restina took Kaori as a hostage, and ordered Yuto to fight against their enemies. Then, the King gave him a sword called Motomeh to protect their kingdom from enemy spirits. Kaori will only be freed if Yuto helps protect Phantasmagoria. Thus, Yuto's journey begins... 

(Source: ANN)