In reality, Ryouta Sakamoto is a despicable NEET. Yet, in the online sphere, he stands as one of the most terrifying players in the bomb-throwing game Btooom! One day, he secures the 10th global rank in the game. Regrettably, his celebration is abruptly interrupted when he awakens to an unfamiliar scene—a remote island, far removed from the comfort of his room. It quickly becomes evident that a sinister group has abducted Ryouta and numerous other individuals—including the blonde bombshell Himiko and real estate agent Kiyoshi Taira—into a harrowing, real-life version of Btooom! The bombs he uses are no longer virtual; instead, they are capable of sending people to a bloody and terrible doom. With his life now at stake, Ryouta must summon the courage and determination to survive this hellish free-for-all, where the only way out is to kill seven other players.