Introduction: """"No one knows when it first appeared, but for as long as I could recall, it had always been there."-------Across the globe, people were receiving a series of """"chain mails"""" from an unknown source, asking them to participate in the """"Colosseum"""".Those who accept this invitation are mysteriously transported to a strange realm, where they are forced to complete the objectives required on each floor.Failure to pass the trials means death in real life, but it is rumored that riches beyond one's imagination could be found at the top...17-year-old Kurose Mikage is also one of the """"challengers"""". But what will happen when he clears Floor 72, and find himself trapped in the worst situation, all because of a wrong wish?An action-thriller featuring an anti-hero main character and a deadly survival game.It is Mikage-kun versus the World!---------"""I know one day, they will eventually find out...And on that day, I would become the most wanted mass-murderer in history.""""...