Warring States of the Navy: Starting by Adopting Doflamingo

Reborn as Sengoku of the Navy, he gets a System that rewards him for adopting children. And so, the title of Whitebeard, the strongest dad, begins to change hands. Doflamingo: “Fufufufufu! Father saved me from the darkness, so I'll give him the entire underworld!” Robin: “If I can find him and make him my dad, I won't have to live like this anymore, right? Dad, wait for me!” Barrett: “Father's strength is something I'll never be able to catch up to in my lifetime.” When Sengoku, once a pacifist admiral, suddenly starts coveting power, while the World Government remains completely in the dark, what will happen when they finally find out?