In what is labeled an origin story, Mackenyu is starring as Seiya, a street orphan and the title hero of the franchise. When a mystical energy known as Cosmo awakens in him, Seiya embarks on a journey to conquer the ancient Greek armor of Pegasus and choose his side in a preternatural battle for the fate of Sienna (Iseman), a young girl who struggles to control her godly powers.
Bean plays a mentor named Alman Kiddo, a man who recruits Seiya into the Knights order, which he founded when he discovered the reincarnated goddess. Tinoco is a man hired to kill the vulnerable goddess.