Aselia the Eternal

Yuuto has been taking care of his step-sister Kaori since the passing of both of their parents. Their life is hard, but they are happy together - at least until the day they are transported to a parallel world that they will later come to call Phantasmagoria... In this world where he can't even understand a single spoken word, his sister is taken prisoner and her captors, calling him an 'Etranger', force him to fight wielding a sword that tries to control his mind instead... Although he first accepts this fate only to protect Kaori, with passing time Yuuto starts to care for the fate of the 'spirits', the girls that fight alongside him, and other inhabitants of this world as well...

You are Takamine Yuuto, an orphan who lives only to care for his sister and ensure they make it through their ordinary everyday lives (with a little help from their friends). One day he is suddenly interrupted by a call from beyond this Earth - he has been summoned through a mystical portal to the distant land of Phantasmagoria! With his sister Kaori held hostage, Yuuto must fight as an Etranger - a warrior of power - and take up the sword to fight alongside the beautiful female Spirits who protect the land from the evil that threatens to consume it. With these new comrades, a tale of desperate heroism, newfound purpose and tender romance unfolds...