Gate[3] (Japanese: ゲート 自衛隊 彼の地にて、斯く戦えり, Hepburn: Gēto: Jieitai Kano Chi nite, Kaku Tatakaeri, lit.

A sequel novel series, Gate Season 2: Jieitai Kano Umi nite, Kaku Tatakaeri, began publication in 2017.

In modern-day Ginza, Tokyo, a portal from another world suddenly appears and a legion of Roman-styled medieval soldiers and monsters emerge to attack the city.

Using modern weaponry and tactics, the Japan Self-Defense Forces easily repels the enemy and passes through the Gate to establish a forward operating base and initiate peace negotiations with the Empire of the other world.

Yōji Itami is a reserve JSDF officer sent to investigate the other world, where magic, dragons and elves are real, using his knowledge of fantasy stories to make his way in this new environment.

[5] While exploring the Special Region, he ends up selflessly aiding its people—including Imperial Princess Piña Co Lada—against an ancient dragon and a band of marauders, thus paving the way for negotiations and saddling himself with a group of local girls who have developed feelings for him.

However, when he humiliates Imperial Crown Prince Zorzal in order to rescue a Japanese prisoner from his clutches, the latter decides to make Japan pay in blood, seizing power as a dictator and preparing for an all-out war.

Thus the JSDF is eventually forced to engage in aggressive combat action to maintain the status quo and bring negotiations with Zorzal's father, Molt Sol Augustus, to a peaceful conclusion.

Following the JSDF's liberation of Princess Piña, the Emperor and the anti-war senators from the Imperial capital, Zorzal goes into hiding and engages in a guerilla war, having his men, wearing imitation camouflage uniforms, and monsters commit terror acts against the civilian population in order to discredit the Japanese and draw them out; but the JSDF's allies and sympathizers rally to their side to defeat the rogue prince.

Takumi Yanai, a former member of the JSDF,[6] initially published the work on the user-generated content site Arcadia from April 2006 until June 2009 under the pseudonym Todoku Takusan (とどく＝たくさん).

A supplementary prequel novel titled Gate: Zero (Japanese: ゲート 0 -zero- 自衛隊 銀座にて、斯く戦えり, Hepburn: Gēto Zero: Jieitai Ginza nite, Kaku Tatakaeri, lit.

A fourth manga, drawn by Chako Abeno and titled Gate: featuring The Starry Heavens, which depicts the three main female characters becoming music idols, began on March 19, 2015, and ended on April 28, 2016, has 2 volumes.

[76] The general positive response to Gate prompted the Japanese military to start a recruitment campaign using the main characters as mascots.