Densetsu no Yuusha da Garn

When the nefarious alien race known as the Org threatens to lay waste to Earth, humanity's last hope rests on a most unlikely champion: a young boy named Seiji Takasugi. After a chance encounter awakens a dormant cosmic power, Seiji finds himself bonded with the legendary mecha, Da-Garn, one of the intrepid "Brave" robots scattered across the globe. Together with his newfound allies, Seiji must embark on a thrilling adventure to unite the remaining Brave robots and unlock their full potential. As the Org's destructive ambitions escalate, the fate of the planet hinges on a courageous boy, his transforming robot companions, and their ability to overcome insurmountable odds against a backdrop of environmental peril and surprisingly inept adult supervision.

✦ AI-drafted summary