The veteran who once saved the world was betrayed by capital, his achievements stolen and replaced by a traffic celebrity, and he was gradually forgotten by the world. After three years of silence, ancient giant beasts returned to Earth again. The idol mecha built by capital was vulnerable and collapsed at the first touch. The city was reduced to ruins, and the whole network fell into despair. At the critical moment, the forgotten veteran forcibly restarted the long-scrapped first-generation mecha. With the powerful performance of extreme heavy industry, he controlled the mecha to tear the giant beasts with his flesh and blood, rekindling the hope of humanity. However, during the battle, he accidentally learned the cruel truth—the Earth is just a petri dish for the "Observers" from outer space, and the life and death of humanity are all under their control. The veteran who fell into the abyss resolutely fused the giant beast genes with the nuclear fire, transforming into the "Abyss Tyrant". He awakened the semi-mechanical undead army, took revenge on the hypocritical capital and celebrities, vowing to lead the death army to break through this interstellar cage, pull the "gods" who control human fate off their thrones, and regain the right to survive belonging to humanity.
