Five hundred years ago, an asteroid shower named 'The End' abruptly terminated the modern era, reducing the Earth to a charred meatball in the blink of an eye. It claimed the lives of three-fourths of the global population and pushed most other life forms, apart from humans, to the brink of extinction due to food scarcity and depleted fertile soils.
Fortunately, after a month of despair, a group of human scientists known as 'Domino' proclaimed that they had discovered a drug capable of rejuvenating the Earth. However, they required an individual with exceptional brainwave resistance to venture into the treacherous 'hole' and retrieve the crucial ingredient they referred to as the 'last piece'.
Enthusiastically, many people seized this opportunity to become heroes and earn the honor that awaited those who succeeded in obtaining the 'last piece'. Amidst numerous sacrifices and deaths, one individual ultimately triumphed and secured the 'last piece'. His visage concealed behind a mask, his true identity and name remained a mystery, leading people to dub him "Mr. Shy".