Gate: Weigh Anchor is a sequel series of Gate - Thus The JSDF Fought There. The plot focuses on the Japan Maritime Self-Defense Forces (JMSDF) force unlike the ground forces in the previous series and Yoji Itami will return as a main character and as a captain of the JMSDF. The new mission for Itami is to travel the seas of the Special Region aboard the Oyashio-class submarine (親潮型潜水艦) Kitsashio (北潮). Weight Anchor takes place 4 years after the story of Gate: Thus The JSDF Fought There.
4 years after the closure of the ‘Gate’, it reopens again after the otaku Captain Yoji Itami (previously second lieutenant) made a successful connection with the other world. As the Japanese government tries to keep the monopoly on the ‘Gate’, they send the JSDF to the other world to build a good relationship with the people there. Captain Gorō Edajima of the JMSDF goes together with the petty officer Tokujima, his subordinate and former cook, on a mission to explore the other world. At that time, an American journalist gets abducted, Edajima and Tokujima get send on a special mission to rescue the journalist. They both board the Oyashio-class submarine ‘Kitashio’ and sail the seas of the other world. But there they get mixed into various problems of the islands and the pirates.
- Tokushima Hajime (徳島 甫) is a Chief Petty Officer arriving with Captain Etajima Goro is a captain of JMSDF in the special region . He is also a great chef.
- Edajima Gorō (江田島 五郎) is a JMSDF captain of Oyashio-class Submarine Kitsashio in the special region he is the ranking JMSDF officer.
- Primera Luna Avion (プリメーア・ルナ・アヴィオン) is a princess of Tinae, nicknames “Tinae’s jewel of blue sea” or “drunken princess.”
- Shura No Arch (シュナ・ノ・アーチ) is the captain of pirate ship Arch and friend of Primera.
- Odette Ze Nevula (オデット・ゼ・ネヴュラ) is a guardian of warship Odell and friend of Primera
- Shamrock Ha Elixir (シャムロック・ハ・エリクシール) is one of Tinae’s ruling “ten members commitee” and an ambitious politician.
- Isla De Pinos (イスラ・デ・ピノス) is a demi human race Lennon with eye on forehead, She is Shamrock’s secretary.
- Caipirinha Em Ruyter (カイピリーニャ・エム・ロイデル) comes from Tinae and a candidate captain of warship Odell.