Piña Co Lada (ピニャ・コ・ラーダ, Pinya Ko Rāda) is the 19 year-old daughter of the Emperor and his concubine, Countess Nell. Realizing at a early stage the impossibly huge gap of strength between the Empire and Japan, she has been busy struggling to protect her home country. After meeting Itami, she was exposed to the Otaku subculture and was strongly influenced by it. A princess from the empire that rules the other world, she wishes to establish peace with Japan, as she knows that there is no way for the empire to stand against the JSDF's military power, and a war with them will eventually lead to its destruction. Piña Co Lada has a serious and stern personality but after spending some time together with Itami she discovered otaku culture and was greatly influenced by it. She is also not familiar with the culture of Japan as seen when the delegate reaching her hand out which, in the princess's culture, is apparently only done for wedding ceremonies. Fortunately, one of the aides tells her what to do. Piña is extremely loyal to the Empire and will do anything to ensure its survival. Originally, she was confident that the Empire, due to its inexpugnable history, will never be defeated. However, after seeing the superior military power of the JSDF, and had later personally visited Japan, Piña later realized how inferior, in every way, the Empire was compared to Japan. Thus she saw it much favorable to establish peace with Japan rather than to continue to wage war against such a potent nation. However, unlike her father and brother, she is smart and wise enough to attempt to smuggle guns through the gate in an attempt to reverse-engineer the weapon for the Empire, despite its failed miserably in the end due to her lack of understanding about metal detector. Furthermore, she also aware that major superpowers in others side of the gate like the US, Russia and China that are interested in invading the Special Region to reap resources and conquer the Empire, in which she becomes quite angry since the Empire will become a nothing more than piece of meat pies ready to be shredded into pieces by three titans who wants the biggest pieces but she cannot do anything against them since she knows that the Empire won't stand single chance against the potential enemies that millions time stronger than the JSDF, which the Empire never even has a single chance of defeat. Like her father, as Duran mentioned the resemblance between Molt and the princess, Piña notably has a slight underhanded side though, unlike her relatives whose actions mainly derive out of personal gain, Piña did so out of jingoistic motives but she retains her realistic outlook like Molt and Diabo, unlike Zorzal's delusional view of life. This was shown when, as they first met and despite the fact they were initially supposed to be enemies, she had taken advantage of Itami’s kindness by sending the 3rd Recon Unit into a suicide mission, during the Battle of Italica, by positioning them alone in the least guarded side of Italica’s walls, the south gate, but this failed as the marauders had attacked the east gate; Itami was aware of Piña’s scheme but decided play along and not include this in his later report. This was again shown when, after Rose-Order of Knights reinforcements arrived late which lead to Itami to be captured and assaulted, which violated the recently made treaty between the Empire and the JSDF, Piña tried to think of a scheme in order to silence the 3rd Recon Unit, before they return to base, though she was later stopped by Grey who pointed out that a simple apology may be enough to solve their dilemma; however Piña apparently went through some extremes such as ordering Bozes to seduce Itami, which failed due to how Bozes's excessive pride had caused further injuries towards the already wounded Itami. After the Hakone Incident, along with Bozes, Piña had again tried another scheme by smuggling a couple of guns to take to her father, only to fail as the existence of the guns were exposed by the metal detector at the entrance of the Gate; as the guards questioned why Piña and Bozes had them, the two was saved by Kuribayashi who said that the guns were meant for self-defense. Piña had apparently stopped doing any further schemes when she firmly made the decision to make peace with Japan. Being heavily influenced by her nation's culture, including slavery, Piña is easily surprised with how virtuous the JSDF are such as how, after neglecting to report to the JSDF that a number of Japanese citizens were captured and enslaved, she was initially unable to understand the anger that Yōji Itami and Kōji Sugawara had exhibited, when they saw the enslaved Noriko, that would lead them to make the choice to waste all their efforts they had made in forming peace with the Empire. As a child, she was shown to be fun-loving and naïve, unaware of the true nature of leading an order and battling. She (along with Bozes) is apparently a yaoi (boys-love) fan, even as a child, and constantly refers yaoi mangas as 'art'. Piña has dark red hair as well as eyes of matching color. She seems to always wear light armor with heavy shoulder guards, and a shirt which slightly exposes her cleavage. During formal events, she wears a dress that lacks a right strap.

GATE
In August of 20XX, a portal to a parallel world, known as the "Gate," suddenly appeared in Ginza, Tokyo. Monsters and troops poured out of the portal, turning the shopping district into a bloody inferno. The Japan Ground-Self Defence Force immediately took action and pushed the fantasy creatures back to the "Gate." To facilitate negotiations and prepare for future fights, the JGSDF dispatched the Third Reconnaissance Team to the "Special Region" at the other side of the Gate. Youji Itami, a JSDF officer as well as a 33-year-old otaku, was appointed as the leader of the Team. Amid attacks from enemy troops the team visited a variety of places and learnt a lot about the local culture and geography. Thanks to their efforts in humanitarian relief, although with some difficulties they were gradually able to reach out to the locals. They even had a cute elf, a sorceress and a demigoddess in their circle of new friends. On the other hand, the major powers outside the Gate such as the United States, China, and Russia were extremely interested in the abundant resources available in the Special Region. They began to exert diplomatic pressure over Japan. A suddenly appearing portal to an unknown world—to the major powers it may be no more than a mere asset for toppling the international order. But to our protagonists it is an invaluable opportunity to broaden knowledge, friendship, and ultimately their perspective towards the world.