Alien Invasion: I Drive a Santana to Save the Apocalypse

In 2060, AI turns against humanity, aliens invade, and electromagnetic pulses turn every smart weapon into a brick. Only Qiao's beat-up 1968 Santana still runs. Following the Morse code on his grandfather's radio, he finds a yellow crystal in Death Valley and casually tosses it onto the back seat. The next day, his car transforms into a three-story mech! Qiao becomes a mech knight, fixing water pipes at the shelter by day and fighting aliens by night, while rescuing Su Lin, the goddess he's secretly in love with. Su Lin only has eyes for the mysterious mech, ignoring Qiao the mechanic. At the decisive battle, Qiao transforms right in front of her, leaving her stunned: the hero who's been protecting me was that invisible man all along? Don't look down on someone driving a wreck. He might just be humanity's savior.