A price too great... On an island where people are forced to fight each other to the death using explosives, Ryouta places his bets on escape via a hijacked helicopter. But what happens when his plan goes abruptly awry? As his allies drop left and right in a hail of bullets and as an unexpected ally lends him a hand, Ryouta becomes mired in the fiercest battle he has yet experienced on the island. When the veil concealing the true intent behind "BTOOOM...