Plot:
The prologue starts with a person transmigrating in Konoha when the 3rd Ninja War is about to start.
He dreams big, that he will learn Flying Thunder God and 8 gates and stuff.
But, he gets kidnapped by Orochimaru for Hashirama cells transplantation research.
To save himself, he pretends to be a seer, and Orochimaru reads his memories, and smirks.
Now, he knows the future, the OG Orochimaru.