The year is 2043. Three years have passed since the vortexes—rifts in spacetime—unleashed the dinosaur outbreak across the world. Ace, an exofighter with the Hammerheads squad, crash-lands on Bikitoa Island due to a vortex that popped up out of nowhere during a routine patrol mission. There they encounter Leviathan, the next-generation AI that forces the rookie into a nigh-infinite series of wargames.A chance meeting with the enigmatic exofighter Magnum teaches the Hammerheads that Leviathan's wargames transport the team back in time—to the exact same date three years ago—for every wargame.Why are the wargames always held on this day in the past? And why does Leviathan summon dinosaurs for them?With countless questions looming over them, the confused team catches sight of an even more astonishing individual.