The Germa Kingdom, also known as the Kingdom of Science (科学の国 Kagaku no Kuni?), is the world's only seafaring kingdom, and a former member nation of the World Government. About 300 years ago, it was the center of the Germa Empire (ジェルマ帝国 Jeruma Teikoku?), an enormous empire formed by the Vinsmoke Family's conquest of the North Blue. Today, the kingdom remains under Vinsmoke rule, and is serviced militarily by the Underworld army, Germa 66; as the territory of the Vinsmoke Family, it used to be Sanji's home nation.
The Germa Kingdom was assembled at Whole Cake Island in the New World and later departed after Big Mom revealed her treachery. The World Goverment later disassociated themselves with the Germa Kingdom.
The Germa Kingdom was first mentioned by Vinsmoke Reiju, who describes it as "a nation without land". Its "territory" is later shown to be comprised of platforms surrounded by railings, that are build on the shells of large snails resembling Den Den Mushi. Those snails are seemingly unaffected by the salty sea, and are strong enough to climb the Red Line. These ships usually move independently, depending on the kingdom's activities at the time, but can be interlocked as they come together to the form the kingdom's "proper shape". As a consequence, the size and the bounds of the kingdom's territory are constantly fluctuating, depending on how many of its ships are assembled at one time.
The Germa Kingdom was once a member nation within the World Government, which allows them the privileges of an affiliated kingdom; this includes the right to attend the Reverie. The kingdom's royal family also has an unusual pull over the legal system, being able to affect the bounty system and to issue direct commands to the Marines. However, after the incident in Totto Land, they lost all the privileges.
From Judge's statements, however, Germa's controversial activities have long threatened its membership within the World Government, and he expects the imminent loss of their right to attend the Reverie as a result of their most recent activities.
The architecture of the Germa Kingdom resembles that of castles; every structure is a tower, a turret, a keep, or a complete castle. Many of the structures are topped by curving conical spires, which complement the outwardly-rounded walls of (some of) the structures. With the exception of trees and other vegetation, the entire kingdom appears to be constructed out of bricks and brick tiles, including the "ground" of the platforms suspended on the kingdom's ships. When various ships are reassembled back into the larger kingdom, the ships' masts and sails are lowered to allow different segments of the structures to be joined back together as well.
Despite the predominantly brick-based appearance of the kingdom's architecture, however, various rooms and laboratories contained within different structures are distinctly futuristic in appearance; such rooms are usually constructed out of metal.
The central, and largest, landmark in the kingdom is the Vinsmoke Family's royal castle, around which the other structures are assembled. It has five tall turrets, with the kingdom's flag flying from the top of the central turret. It normally rests on a group of 36 platforms, at least some of which can separate.
One of the largest rooms in the castle is the throne room, which is prominently adorned with militaristic decor, including a large spread-winged bird behind the royal throne itself. The Germa Kingdom's flag is visible behind the bird, and two large sea maps are hung up on either side of the throne. A chandelier, as well as dark vertical banners bearing the number "66", hang from its high ceiling; the banners line the entire length of the room.
Roughly in the room's center, at the base of the stairs leading up to the throne, is a table encircled by numbered chairs. Each Vinsmoke sibling has an allocated seat at the table, corresponding with their designated number.
One of the rooms inside the castle - the one used to accommodate Vinsmoke Sanji upon his return to the Kingdom - is a very large and spacious room containing a portrait of Vinsmoke Judge during the Conquest of Four Nations. It is located in the central turret of the castle, with a tall window and curtains that open onto a balcony overseeing the Kingdom. The room is adorned with various other fittings and pieces of furniture, including tables, large chairs, numerous cupboards and drawers, mirrors, drapes, candelabras and chandeliers, and potted plants.
Soldier DepotThe depths of the royal castle are shown to contain at least one large cloning laboratory, within which Germa 66's scientists work. It contains a multitude of numbered, liquid-filled capsules, each containing a Germa 66 Clone Soldiers (複製 (クローン) 兵 Kurōn Hei?). It is most likely a relatively recent addition to the castle, since the scientific discovery used in the cloning process was a recent discovery of Judge and the World Government scientist Vegapunk.
The laboratory is highly secretive and off-limits to everyone except the kingdom's scientists and members of the Vinsmoke Family. Yonji mentioned that even the royal children were not permitted entry during their childhood, and an adult Sanji was shocked to discover what was contained inside the depot.
The castle has a dungeon where Sanji was held as a child for 6 months. It is reached after descending a long flight of winding stairs.
One of the kingdom's independent towers is named "Yonji Castle" (ヨンジ城 Yonji-jō?); as the name suggests, it is the residence of the kingdom's fourth prince, Vinsmoke Yonji. His fortress is made of his own individual ship and is later assembled at the Germa Kingdom platform. He is seen recovering there after his fight with Sanji. The fortress has an infirmary containing a device called "the Press Machine".
|Vinsmoke Judge||Vinsmoke Sora †||Vinsmoke Reiju||Vinsmoke Ichiji||Vinsmoke Niji|
|Vinsmoke Sanji ‡||Vinsmoke Yonji|
- †: the character is deceased.
- *: the character's status is unknown, or show additional information. Hovering the symbol may give further details.
- ≠: the character is non-canon.
- ‡: the character is no longer part of this group. Hovering the symbol may give further details.
The Germa Kingdom is ruled by the Vinsmoke Family, whose patriarch, Vinsmoke Judge, is the reigning king; his wife, the late queen Sora, is deceased. Unusually among royal families, the Vinsmokes are also the commanders of their nation's military, Germa 66, leading them directly in combat and other mercenary situations.
The majority of the citizens in the Germa Kingdom are predominantly-male soldiers who comprise Germa 66. Most of those soldiers are clones of former exceptional soldiers, created using the Vinsmokes' technological capabilities.
All other known citizens of the kingdom are servants who work directly in the employ of the ruling family. This includes handmaidens, cooking staff headed by Cosette, and medical staff who work in the medical ward. There are also scientists who work on the Soldier Depot in the castle's secret laboratory. One particular scientist also served as Judge's personal aide in observing and supervising the training regimen of the Vinsmoke siblings in their childhood.
Each of the snails that carry a part of the kingdom double as a ship. There are two masts at the top of each ship, which carry large black sails bearing the number "66". Their shell is modified, having docking knobs for when the ships reassemble the kingdom, that resembles two portholes on each side. The platform is surrounded by a railing. Each ship appears to be at least three times as wide as the Thousand Sunny.When gathered together, these snail ships will either remain in their shells or socialize with one another.
The Vinsmoke Family is shown riding in a "Cat Carriage" (猫車 Nyasha?), which is carried by a Cat Car, on their way to a meeting with Charlotte Linlin and her daughter on the day before the later and the Vinsmoke's third son wedding day. The carriage is large enough to carry six thrones, and tall enough so that Judge could stand up straight in it. The carriage is decorated with the kingdom's symbol and has a garuda figure on its roof.
The carriage is missing its left door, after Luffy pursued and tried to persuade Sanji to leave with him, and Sanji instead kicked Luffy away (including the door he was hanging on to).
About 300 years ago, the Germa Kingdom was at the center of the Germa Empire, which spanned the entire North Blue for 66 days. Since its loss, the Kingdom's ruling family have made extensive efforts to regain their empire, with the current king leading Germa 66 in an infamous event known as the Conquest of Four Nations. While the details of the event are unknown, he was photographed standing over four vanquished North Blue kings.
At some point in the past, Judge married Sora, thereby making her queen consort of the Germa Kingdom. She gave birth to the Kingdom's sole princess, Vinsmoke Reiju, before later giving birth to its four princes, including Sanji; at the time of the sons' birth twenty-one years ago, the Kingdom was located in North Blue. Due to drugs she took prior to the birth of her sons, Sora became gravely ill, spending the remainder of her life bedridden in the medical ward before passing away.
Sanji spent his childhood in the Germa Kingdom up until the age of 8, during which time Judge put his children through a stringent training regimen and monitored their progress. The last 6 months of Sanji's life in Germa were spent in the dungeon of the royal castle, where his father had ordered him to be imprisoned as his way of erasing Sanji's existence from his life. Judge also staged a state funeral for his third son, informing the rest of the Kingdom (including his other children) that Sanji had died in a shipwreck.
Thirteen years ago, Germa 66 accepted a contract to invade and defeat the island of Cozia in East Blue. As the Kingdom crossed over the Red Line from North Blue into East Blue, Reiju freed Sanji from his cell and helped her younger brother escape the Kingdom. While Judge caught Sanji trying to flee, Judge allowed Sanji to leave on the condition that Sanji never associate himself with the Vinsmoke name ever again. With Reiju's help, Sanji successfully made his escape on board a cruise ship docked on Cozia's coast.
Arc de l'île entière de gâteau
À un certain moment après Sanji a quitté le Royaume Germa pour commencer une nouvelle vie dans le bleu de l' Est, les Vinsmoke et Charlotte familles ont conclu une alliance politique.  Dans le cadre de cet accord, un mariage a été arrangé entre de la famille Vinsmoke le troisième fils et la 35e fille de la famille Charlotteattacher les lignées des deux familles qui ne sont tenues que treize ans plus tard car la famille Vinsmoke n'a pas réussi à trouver leur troisième fils, Sanji, qui vivait dans la Baratie, se gardant discrètement. Ce n'est que par les contacts des pirates de la Grande Maman, surtout après que Capone Bege a acculé Sanji avec les conséquences de la mort horrible de son mentor pour son refus d'assister au mariage, que Sanji est retourné dans son pays natal. En prévision du mariage, le Germa a commencé convergeant progressivement Uni dans le lac Aprico sur toute l' île gâteau . 
Quelques jours avant le mariage, Sanji est retourné dans son pays d'origine, où il a retrouvé son jeune frère , sa sœur et son père après 13 ans d'éloignement. Après réprimandant les deux Yonji et les tentatives de Reiju pour le forcer à accepter le marrige arrangé, le juge a contesté Sanji pour régler leurs problèmes avec un combat physique.  À la fin du duel, qui a eu lieu dans une cour à l' extérieur du château Vinsmoke , le juge a expliqué Sanji le but de l'alliance avec Big maman et avait sangle reiju (fake) explose sur wristlets les bras de Sanji, pour le forcer à coopérer avec le mariage. 
Le jour avant le mariage, Vinsmoke Ichiji et Vinsmoke Niji retournés au Royaume Germa après l' exécution de leur mission sur l' île de Broc Coli .  Les Vinsmokes réunis pour discuter de leurs a procédé affaires politiques tout en dînant dans leur salle du trône, mais la discussion rapidement désintégré en une confrontation entre Sanji et les autres membres de la famille.  Après le repas, Sanji trouvé Cosette(le chef de la cuisine du ménage royal, dont la nourriture avait indirectement provoqué la confrontation) a été violemment battu dans le château. Jugeant sa vengeance contre Niji, Sanji rencontra Yonji, qui conduisit Sanji au laboratoire contenant l'armée de clones de Germa 66. Là, ils ont été rejoints par Ichiji et Niji, qui (avec Yonji) a procédé à l' attaque Sanji. 
Après l'agression, Reiju a trouvé un Sanji meurtri dans le laboratoire. Elle ordonna aux scientifiques de Germa de laisser Sanji à ses soins, avant de le ramener dans sa chambre. Après reiju traité les blessures de Sanji, toute la famille royale ont été vus au large par leurs citoyens acclamant comme ils ont procédé à tout le gâteau Château pour la cérémonie d'échange de cadeaux pré-mariage. 
Il est révélé plus tard que le mariage faisait partie du plan de Big Maman d'assassiner la famille Vinsmoke, afin d'avoir accès à la technologie de clonage du royaume. Cependant, après que le plan d'assassinat ait été contrecarré pendant la cérémonie de mariage, les Vinsmoke (à l'exception de Sanji) ont réussi à s'échapper avec succès dans leur royaume. Nusstorte et une armée de dix mille les ont poursuivis, mais ils ont été complètement vaincus. Après Niji dupé Mont-d'Or en révélant l'état des chapeaux de paille, Ichiji a donné l'ordre pour les navires de Germa à la voile. 
Quelques heures plus tard, les forces de Germa Uni sont arrivés à l' île et ont attaqué Cacao la flotte de la Grande maman Pirates entourant l'île, sauver Luffy et Sanji dans le processus. 
Alors que la bataille fait rage, la grande maman Pirates apporté des balles anti-Germa et les a utilisés pour blesser les frères et sœurs Vinsmoke. 
Quand les chapeaux de paille ont finalement échappé à Totto Land, Germa 66 s'est préparé à se retirer. Cependant, Big Maman est arrivée à l' île avant Cacao pourraient battre en retraite. 
- Like many nations in the One Piece world, the Germa Kingdom contains inspirations from a number of real-world countries and cultures:
- The architecture of the kingdom, with its castles, towers, and keeps, resemble those of Medieval Europe. It is similar to the architecture of the Lvneel Kingdom, which is also located in the North Blue.
- Germa's flag bears the Nordic Cross, which is featured in the flags of the various Nordic nations.
- The Kingdom's name Germa and their militarism ideology may also be based in Germany, particularly Nazi Germany which featured golden eagles and distinctive dark uniforms as insignia and was a militaristic and aggressive nation. The Nazis promoted a concept of Greater Germany that matches the Vinsmoke Family's singular focus on warfare and their ambition to reconquer the North Blue to rebuild the Germa Empire.
- The large bird in the kingdom's throne room could be a reference to:
- In addition, Germa's insignia, as displayed in their throne room, is likely a reference to the insignia of the Nazi-inspired terrorist organization Shocker, from the television and manga franchise Kamen Rider.
- Coincidentally, germa is also a regional name for yeast in some parts of former Yugoslavia, which goes with Sanji's cooking theme.