Yagate Eiyuu Ni Naru Saikyou Shujinkou Ni Tensei Shitakedo, Boku Ni Wa Ni Ga Omokatta You Desu summary:

A video game geek has been reincarnated as Luke, the hero of the epic RPG Legend of Spirit. With a gifted character and perfect knowledge of the game, his goal was a perfect and complete happy ending that surpassed the original story.However, the hero's mission was too heavy for an ordinary person to bear. It was too easy for something important to fall away.In this world, expediency does not happen. If Luke does not hold the sword, the world will be destroyed.So the boy puts on a mask and plays the hero, Luke.This is a false heroic tale of a boy on a mission to become a hero.