Aselia the Eternal: The Spirit of Eternity Sword (2011)

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...