Becoming an undying warrior is a great thing for everybody, but for them, it is a curse. They've been secretly protecting humanity for centuries, but after accidentally exposing their "powers," they've become targeted by an unknown person. Habang hinahanap nila ang taong dahilan kung bakit nalaman ng ibang tao ang tungkol sa pagkatao nila, hindi nila kailanman naisip na may mabubuhay na katulad rin nila.