Sanji was born in North Blue into the Vinsmoke Family, the current royal family of the Germa Kingdom. He and his three brothers were all born on the same day, with Sanji being the third son of the family, thereby making him the kingdom's third prince.
Sanji's dad, Vinsmoke Judge, explained to his children at a young age that he had given their bodies genetic enhancements, granting them the capability to develop extraordinary abilities. He also told them of his intention for Sanji and his four siblings to lead their kingdom's military arm, Germa 66, in the future, and started instructing them on how to unleash their genetic potential. While Sanji's siblings excelled at their exercises and their bodies evolved, Sanji repeatedly lagged behind as a result of his body staying human for some unknown reason. This made him an easy target for his brothers, who oppressed him frequently, and Judge did not intercede because of his contempt for Sanji's frailty. One day, Judge found him giving food to a rat in his bedroom and yelled that Sanji would have to quit cooking and work even more if he wished to catch up with his siblings. He then tossed the food and the rat out of the palace, making Sanji to cry. Sanji continued to get abused by his brothers after which Reiju, his older and only sister, habitually nursed his wounds and bruises.
Soon, Judge became persuaded that Sanji would never acquire superhuman abilities and decided to delete his son's existence from his future plans by placing an iron mask on him and securing him in a Vinsmoke castle underground prison.
During the next half year of Sanji's captivity, his mask was only taken off when getting food from the guards. At some point, he read about the All Blue from a cookbook he was given. His brothers in time found out that he was still alive and sometimes visited the underground prison only to keep tormenting him. Reiju visited the dungeon to treat her brother's injuries. After the Germa Kingdom went passed the Red Line into the East Blue, Sanji proclaimed to Reiju that he wished to flee away and become a chef. Reiju broke open Sanji's cell, helping him to flee. As Sanji was escaping, he bumped into his dad. Judge decided to permit Sanji to leave on the condition that he never tell anyone about their relationship. While Germa 66 was striking the island of Cozia in the East Blue, Reiju took him to a cruise ship called the Orbit and told him to never return to the Germa Kingdom. Having fled the kingdom, Sanji broke all ties with his family and renounced his title as a prince.
That was, until Sanji was presented an invitation by Capone Bege, who revealed to him that he was arranged to be married to the 35th daughter of the Charlotte Family, Pudding, by Big Mom and his father, Vinsmoke Judge. However, he could not refuse as he was threatened and forced to participate in it in order to protect the ones he loved.
The emotional heaviness of what he was doing did not hit him until he was on board Big Mom's ship. He had hidden his identity from his crew, and now he had betrayed his captain, Luffy, by leaving without his permission. His nerves racked him throughout the whole journey to Whole Cake Island.
When he finally disembarked in Whole Cake Island, he was informed by Vito, a member of the Fire Tank Pirates, that someone from the Vinsmoke family would be coming to pick him up and take him to the ocean-going Germa Kingdom where he would be reuniting with his family.
Including the first ten years of his childhood, his father and brothers were basically strangers to him. "Why do I have to see them again..." He thought gravely.
He stared at the sky, taking in a deep breath before thinking that there was one member of the family he would be happy to see again. As he thought of his older sister, he realized the image he had of her in his head was very out of date. His memory of Reiju was that of a small girl with short hair, wearing a light pink dress with the letter "Z" and number "0", and a dark ascot. As the oldest child of her family, she was taller than the rest of her brothers, and it was a fact that greatly pissed off Sanji's three brothers. He chuckled under his breath.
"I don't even know what she looks like now." Sanji thought passively.
"I hope you weren't waiting long, were you?" came a woman's voice from behind him.
Sanji swiftly turned around and swallowed at the sight before him. Standing there before him was a slim young woman with shoulder-length hair, covering her right eye and curling upwards at the tips. She was wearing a short white satiny dress with a frilled neckline and a cravat, and dark high heels.
"Wow..." He thought, as his eyes ogled over the female stranger, "She's hot!"
To be continued...
