A space colony teen's life changes when she befriends a refugee and joins underground mecha duels. Her world is further shaken by the arrival of a mysterious Gundam and its young pilot, both sought by authorities.

Zagan is feared by the masses as an evil sorcerer. Both socially awkward and foulmouthed, he spends his days studying sorcery while beating down any trespassers within his domain.

Together with her humanoid friend Reg, a young girl named Riko hopes to one day solve the mysteries surrounding the endless chasm known as the Abyss.