30 Years Since the Prologue

[By the Studio that brought you < The Extra’s Academy Survival Guide, I Killed an Academy Player > I "transmigrated" into a world I'd never seen before. For thirty years, I believed I was living in a classic fantasy RPG. I became a war hero, retired, and thought I was finally about to see the ending. But... Those thirty years were only the prologue. It turns out the real story is about an academy?