人類と深海棲艦との戦争は当初の想定以上に激化していく。日毎に力を増す深海棲艦達に対抗するため、人類は新たな力を見出す必要があった。そして、艦娘が搭乗することで真の力を発揮する人型機動艦、通称『ウォーフリート』は完成した。全ては勝利のために――。■長門国（ナガトノクニ）：全長22.4m 艦娘「長門」が搭乗することでその真価を発揮する機動兵器である。攻守共に圧倒的な性能を持った重量型ウォーフリート。■ながもんの歴史調べてたらめちゃかっこよかったりパシフィックリムめちゃ面白かったりしたからついロボ化しちゃったんだ■表記に関してですが「戦艦型機動艦」というのも（艦種が二重）少しおかしな話なので「超弩級・準弩級」のような意味合いで「戦艦級」とつけています。型は「長門国型」になります。

The war between humans and deep-sea ships becomes more intense than originally expected. In order to compete with the deep-sea ships, which are becoming more powerful every day, humanity needed to find new powers. And the humanoid mobile ship, commonly known as `Warfleet,'' which demonstrates its true power when the ship girls are on board, has been completed. All for the sake of victory. ■Nagato no Kuni (Nagatonokuni): Total length 22.4m It is a mobile weapon that shows its true value when the ship girl "Nagato" is on board. A heavy war fleet with overwhelming performance both offensively and defensively. ■When I researched the history of Nagamon, I found out that it was really cool and Pacific Rim was really interesting, so I ended up turning it into a robot. ■As for the notation, it's a little strange that it's called a "battleship-type mobile ship" (it has two types of ships). The name battleship class'' means something like `super-dreadnought class/semi-dreadnought class.'' The type is "Nagato Kuni type".