Three years ago, in the land of Reinbulk, a Legendary Hero was sum the De Now, five students are suht against the De and the deical affinity and the Luxeria Kingdo him to his worldHowever, Yuu is actually the previous Hero that had fought the De Moreover, he is perplexed at the situation since he knows the De has not returned since he sealed him If the seal was ever broken then he would be automatically summoned instead of normal summoned Since he already saved the world once and the De hasn’t been unsealed, Yuu decides to leave the demons to the new heroes and retire from the Hero business So he decides to become an adventurer