If you haven't yet, watch the anime before reading this cause spoilers

Y/N, an inter-dimensional hero. Y/N has become a complete legend in thousands of dimensions. Whether it is facing a monster, a disaster, a god, or other horrors, Y/N would always emerge victorious. Undefeated, unmatched.... Unbelievably tired. After spending much of his life fighting evil, Y/N wants nothing more than to return home. Of course as a reward for his heroism, he was sent to his home dimension, Earth.... Right?...