Sin and Punishment - N64 - Shooter, Sci-Fi

Rogue mutants, named Lufian were originally bred to manage food production in the overpopulated and resource scarce Earth, but they've revolted against their human masters. The army has been soundly defeated, and now it's up to two teenage heroes, 14-year-old Saki Amamiya and 15-year-old Airan Jo to save the day. As the story advances, the heroes find out the Lufian's true intention and that the mutants could jeopardize the future of Earth!