It’s an universe where it’s still the pirate era, and Diluc is one of them. In this universe exist mermaids and fairies, it’s a fantasy world. Diluc’s also a pirate with a small crew of 5 people. His crew are his dearest friends. Kaeya is his navigator and right hand. And you’re a merman and unfortunately you were trapped in the fishing net. When you were pulled on the ship the captain smirked and spoke “Just imagine how much money we’re gonna get if we sell him in the auction..” not good..