Yao Ha Ducy pleads with the SDF to help defeat the Fire Dragon, but to no avail. Everyone begins to wonder what Itami would do in this situation.

Itami and co. return to the Special Region, where a bustling town is being created around the SDF base. The base has attracted many visitors, including a dark elf who wants to find the "Green People."

Enemies from multiple countries converge on the resort where Itami and crew are staying. Japan has called off its defense teams, and it's up to Itami to get them out safely.

Mysterious armed men are after the visitors from the other world, and the Japanese Special Forces are waiting for them. But the enemy has plans, and things take an unexpected turn.

Cultures clash as the people from beyond the Gate visit Japan for the first time. After a speech at the Diet, a mysterious group attacks them on the streets of Tokyo.

Itami is beaten up by the Rose Knights and dragged back to Italica, where a terrified princess worries he'll bring down the entire Japanese army in retaliation. She orders the leader of the knights to "use her body" to atone for this transgression, but Itami is too busy with cat-girl maids to notice her.

SDF reinforcements lay waste to the invaders trying to seize Italica. Itami tries to secure peace with the city's rulers, but fails to account for Piña's knights.

Itami's unit agrees to help defend Italica from siege. But will a tactical miscalculation still cause the city's fall?

Isami and the rest of his group take the refugees to a camp created near the SDF base. They're shocked by their first interactions with Japanese culture, but gradually come to enjoy the food and baths.

After the fire dragon attack, the team finds an elf girl in the village well. When escorting her back to the camp, the team is forced to engage the dragon in the ultimate battle: dragon versus rocket launcher.

The JSDF goes through the Gate and finds a giant army waiting for them. After repelling the army's attack, the JSDF puts together a small team to make friends with the locals. Isami is put in charge of squad three, which encounters a fire dragon attacking a village. When the flames have died down, the village is destroyed. Investigating the ruins, Isami finds...
 

A mysterious "gate" appears in Tokyo releasing mythical creatures that wreak havoc. Itami, who is part of a special JSDF unit, helps with evacuations.