Hayato Hattori was reincarnated into different worlds 3521 times. Levels, states and in many more ways Hayato was the strongest, his role had become to save other worlds.
He saves many people but because saying goodbye is hard he gets along with no one.
He wants nothing more than to hide his strength and live a normal life. However he’s just too strong, in this new world as well, his strength is revealed.