Under the direction of his strict and occasionally overbearing father, Kamorge, Basion hopes to become a soldier and wage war against the Junaris Empire. He roams the land with his father, his spirtual sister (Milea), and his ATAC engineer (Puck), avoiding the Imperial Army-which has been searching for his father as long as he can remember. In the meantime, Bastion spends most of his time training the ways of ATAC combat.