Eien no Aselia: Kono Daichi no Hate de

Yuuto has been raising his step-sister Kaori alone since both their parents died, and they are managing — until the day a mysterious force transports them both to a world called Phantasmagoria. He cannot understand a word anyone says. Kaori is taken prisoner. The people holding her, calling Yuuto an Etranger, force him to fight using a sword that attempts to override his mind. He fights at first only to get Kaori back. Over time, the spirits — the girls who battle alongside him — and the people of this world come to matter to him too.