Hagoromo Otsutsuki

The flashback follows Hagoromo and Hamura confronting Kaguya and the sealing history tied to the Ten-Tails and the moon.

The successor conflict between Indra and Ashura reframes the Naruto and Sasuke rivalry through the Six Paths lineage.

Black Zetsu's account shows Kaguya's arrival, the God Tree fruit, and the first Infinite Tsukuyomi.

After Kaguya is sealed, Hagoromo spreads Ninshu, showing the roots of the later shinobi world.

Near the end, the Sage of Six Paths appears to Naruto and Sasuke and changes their power.