Kaguya killed Obito and Team Seven except for Naruto. But before Sasuke died he gave his six paths power to Naruto so he could kill Kaguya. During the fight against each other, Kaguya teleported Naruto and herself to the dimensional gap. After he sealed Kaguya in the gap, he fell down to the underworld to be only found by a certain child-like satan. sorry, suck at summary.