Ryouhei Arisu, a disenchanted high school student, yearns for an escape from his mundane existence. During a night out with friends Daikichi Karube and Chouta Segawa, a colossal firework launches them into the mysterious Borderland. This realm hosts a lethal game where survival hinges on completing perilous challenges. As they strive to unravel the path home, Ryouhei embraces a newfound sense of vitality amidst the high-stakes gameplay.