Eien no Aselia
English title: The Eternal Aseria
Japanese title: 永遠のアセリア
Alternative titles: Eien no Aseria: The Spirit of Eternity Sword
Type: OVA
Source: Visual novel
Episodes: 2
Status: Finished Airing
Aired: Jun 24, 2005 to Mar 24, 2006
Duration: 29 min per ep
Rating: PG-13 - Teens 13 or older
Studios: Studio Matrix
Producers: Japan Home Video
Genres: Adventure, Drama, Fantasy

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)