When a massive Warrior Beast named Garudinus smashes through a dam, the four characters realize they were chosen by ancient crystals. The first transformation is iconic.
Like most shows in this genre, the lines are clearly drawn. However, Episode 1 hints at a deeper mythology—the idea that the heroes are descendants of aliens, not just random humans gaining powers. Gransazer Episode 1 In Hindi
Here's a brief summary of Gransazer Episode 1: When a massive Warrior Beast named Garudinus smashes