From the bottom-tier employee of a black company to a historical hero— The famous Spartan hero Leonidas. He was actually Takei Reo (Leo), a bottom-tier salary man who reincarnated from a modern Japanese black company… In Spartan society where “strength is everything” that makes even black companies pale in comparison, and facing the mighty Persian Empire standing in their way… The story of Leo—who understands the feelings of the weak—transforming Sparta into a powerful nation through his unique actions begins now