A gate to another world appears in the middle of Tokyo’s Ginza District, and the citizens of Tokyo are attacked by cavalry, dragons, and demons. Itami, an otaku who was in the area to purchase his long-awaited doujinshi, becomes the accidental hero of the day and gets promoted to second lieutenant of the Self-Defense Force. Not long after, he’s sent on a mission through the gate into the other world with typical otaku-like expectations of what he’ll find there.
Itami’s efforts to save a doujinshi exhibit turn him into an accidental hero. Now second lieutenant, he’s sent through the gate into the other world.
The emperor of the Imperial Capital orders an attack on the intruders from another world. Itami and the JSDF try to get acquainted with the locals.
Itami finds an elf, the lone survivor of a town destroyed by the capital. As Coda Village evacuates to escape a fire dragon, Itami finally meets a mage and a Goth-loli.
The JSDF leads refugees from the fight with the fire dragon to camp. Chuka, Lelei, and Rory explore their new amenities and try to learn more about their saviors in green.
Itami leads his unit to Italica. When he arrives, he comes face to face with Princess Pina, who recruits the men in green to help the city ward off bandits.
The battle for Italica rages. Against Princess Pina’s orders, Rory Mercury and the JSDF arrive to reinforce the East Gate.
Itami has been (accidentally) captured and beaten by Princess Pina’s knights. While the princess worries, the JSDF discovers that Itami didn’t really need to be rescued.
While the princess negotiates with Japanese officials, Lelei, Rory, and Tuka testify, on national television, what happened the day Itami’s men fought the dragon.
Itami’s ex-wife takes the girls from the Special Region on a shopping spree! Later, while the group relaxes at a hot spring, foreign forces launch a covert attack.
When operatives from three different nations attack, Rory turns the hot springs into a blood bath, and Itami must carefully maneuver the girls back to the Special Region.
While the princess takes steps to orchestrate peace with Japan, a village pops up around the JSDF base. At a tavern, Itami and Rory’s evening is interrupted by a dark elf.
As Yao Ha Ducy desperately attempts to ask the JSDF to save her village from a fire dragon, Itami travels to the mountains to deliver goods to the princess.
Pina organizes a party to cover a secret meeting with Itami and the senators. Suspicious, the capital sends Pina’s ruthless older brother, Zolzal, to investigate.
In the aftermath of the Empire’s first earthquake, Pina chances bringing Itami and the JSDF to the emperor, and a face-to-face meeting with Zolzal reveals a terrible truth.
Tuka, teetering on the edge of her sanity, begins to start seeing Itami as her late father, and he struggles with the solution that he thinks will save her.
Queen Tyuule sends her spy on a mission to ignite tensions between Japan and Empire. Meanwhile, Itami and the girls reach Yao’s village at the same time as the dragon.
Itami takes the fight into the dragon’s nest in hopes that his world’s weapons combined with the Special Region’s magic have enough power to take the dragon down.
In the shadow of Zorzal’s rage, Pina and Sugawara prepare for the peace talks. Meanwhile, Lelei prepares for an academy presentation in a city filled with magic scholars.
Zorzal takes the crown, and his plans to destroy the peace spin into motion. In Rondel, Lelei’s sister realizes, to her chagrin, just how accomplished her little sister is.
Sherry becomes a fugitive after helping Marquis Casel escape the Cleaners. With no one else to turn, and the Japanese avoiding the conflict, Sherry reaches out to Sugawara.
The battle at the Jade Palace ignites conflict across the Empire. While Itami schemes to protect Lelei from assassins, reporters from Japan investigate the Special Region.
Imperial forces continue to fight at the Jade Palace, landing Pina in the crosshairs of Zorzal’s reign of terror. Meanwhile, another attempt is made on Lelei’s life.
The JSDF launches an attack to rescue its allies. Meanwhile, Pina’s generals make a desperate ride to the capital to save her.
Itami and his squad charge into the capital to rescue Princess Pina. While Lelei, Rory, and Itami storm the throne room, Tuka, Yao, and the SDF move to rescue the emperor.