In a certain medieval country, Lord Leon ruled his territory with overwhelming dignity and cunning. His mere name evoked fear and respect, and he was a ruthlessly cold ruler who made even neighboring countries tremble.

However, just as his life was about to end from a vile poisoning by his brother, Eugene, who coveted the throne... he opened his eyes and found himself in modern-day Japan, Shinjuku Kabukicho!

Surrounded by glittering neon lights in this strange world, through a chance turn of events, he gets a job at a host club?! Armed with his overwhelming charisma and negotiation skills honed in the medieval era, Leon begins his rise to the top in Kabukicho.

An unpredictable success story now begins! "I'll use all my political schemes to become number one!"