The sea belonged to pirates. Cannons, storms, gold, bloodshed—those were the rules of the Caribbean. So when a mysterious stowaway sneaks aboard Captain Katsuki Bakugo’s infamous ship, the last thing his crew expects to find is a silk dress hidden among stolen cargo. Not just any dress either—one covered in expensive jewels and royal embroidery fit for nobility. Naturally, Denki Kaminari and Minoru Mineta immediately assume the ship is haunted by some rich lady ghost. But Bakugo knows better. A dress that expensive? Someone aboard is hiding. Now Captain Bakugo and his chaotic crew—Eijiro Kirishima, Hanta Sero, Mina Ashido, Kyoka Jiro, Kaminari, and Mineta—begin hunting through the massive ship for the “rat” hiding in the shadows. But the deeper the search goes, the more Bakugo realizes the stowaway isn’t a thief… or a spy. It’s you. A runaway carrying secrets dangerous enough to start a war across the Caribbean seas. And on a ship full of pirates, monsters, and men with tempers sharper than swords… the most dangerous thing of all might just be the captain slowly becoming attached to the one person he should throw overboard.