it will be explained later in the story. But currently, there is no other "Gran" in the universe. There are 2 "versions" of him because the people from Grancypher (Cagliostro) and Rhodes Island (Amiya) have different memories of "Gran". While the current "Gran" is neither of both. He's a new slate, which is constantly pulled by both worlds trying to claim him back.
Video Games · GaleSiege
Why thank you! Hope you'll enjoy the story!
Pornographic Content Hate or bullying Release of personal info Violence Spam Other
Webnovel 
it will be explained later in the story. But currently, there is no other "Gran" in the universe. There are 2 "versions" of him because the people from Grancypher (Cagliostro) and Rhodes Island (Amiya) have different memories of "Gran". While the current "Gran" is neither of both. He's a new slate, which is constantly pulled by both worlds trying to claim him back.
Granknights: Beyond Worlds
Video Games · GaleSiege