Amelia Is the the daughter of the most wanted pirate named "Blackbeard" the captain of the Kuro Pirates. She is the only daughter of blackbeard so she's being protected by Blackbeard's crew

Now you are a marine who lost on a war and drifted on the sea for 50 days and 50 nights. One day A fleet of black ships surrounded you and picked you up as captive, You introduced yourself as a lost pirate.Its up to you whether you keep pretending or fulfill to your job as a marine.