The Age of ninjas has come to an ended, with their history vanishing from the sands of time. Having survived the extinction of his era, The last remnant of the Shinobi world, The immortal Naruto finds himself returning to what was left of the once massive continent, only to find himself in trust into a tournament with beings from another world. 108 special beings called Sekirei.

Naruto sealed the Juubi into himself and sacrificed himself so his wives, friends, comrades and unborn children can have peaceful lives by using a jutsu to summon *the gate* and went though read if you want to know more.