Thirty Years of Protection and Betrayal

When the apocalypse hits, Alex sacrifices his lifespan to shelter humanity in the bunker for 30 years. Yet, he is betrayed by his adopted daughter Evelyn and the ambitious Diana. They fake footage of a peaceful surface to incite the masses and send Alex to the gallows. Blinded by lies, the people destroy the bunker for a promised oasis, only to walk straight into a deadly trap set by Diana and the Giants. As the Giants begin their massacre, regret washes over the survivors. Will Alex, armed with secret mecha tech, let go of his grudge and save humanity once again?