Arisu Ryouhei will leave high school soon, but he's trying to avoid thinking about his future. One night when he is with his two friends Daikichi Karube and Chouta Segawa, they see an abnormally large firework shoot into the sky. Blinded by the incredibly bright explosion, the three find themselves transported to what is known as the "Borderland." The only inhabitants of this world are participants of a deadly game where specific tasks must be accomplished if they wish to survive. The three friends begin playing the game.
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