The accident doesn't transform Stalker into a hero with a mech suit, it makes him a monster, and the show watches that happen without flinching. Saldo isn't a weapon to be controlled; he's what erupts when you trap something that feeds on rage inside a body built to survive anything. This is a one-shot that understands the difference between becoming powerful and becoming something that can't be stopped, and it doesn't offer you the comfort of redemption.

In 2019, a newly discovered form of energy has advanced cybernetic medicine, but the city of Cyber-Wood still holds Cancer, a lawless slum full of its poorest and most violent residents. A project to bring order there centers on experimental armor powered by its wearer's spiritual energy, with researcher John Stalker as the test pilot. A cult based in Cancer wants to resurrect the God of Darkness and sees John as the ideal vessel. The test goes wrong, John is soon kidnapped, and a demonic spirit turns him into Saldo, a mythical cyber-beast driven by hate and evil. His girlfriend and a tough cop set out to find him. The single-episode OVA blends mecha and science fiction with the supernatural.