Prologue: Divinia's Legends

When [Name] gets reincarnated into their favorite novel series Divinia, they're bamboozled...until they realize they've retained all of their knowledge on the books! [Name] wants to use this to interact with their favorite characters, but the plot of Divinia is as follows: a courageous hero gathers allies to defeat the tyrant ruler of the strongest nation, Ceir. And so, [Name] has a brilliant idea: why not join the hero and his gang and automatically be on the winners' side! It's a foolproof plan, but with an overprotective bodyguard and a harem in the making, did [Name] accidentally change the course of the story?
(Reader is Gender-neutral and uses they/them!)