Eien no Aselia

In the world of Phantasmagoria, Yuto Takamine and his younger sister-in-law Kaori are suddenly summoned to a realm where they are confronted by the King, who takes Kaori as a hostage. The King demands that Yuto wield the sword Motomeh to fight against enemy spirits and protect their kingdom. Yuto's only option to free Kaori is to accept the challenge, and thus, his perilous journey begins as he navigates this new world and confronts the dangers that lie within.