The setting is an Earth effectively ruled by aliens. The aliens appeared simultaneously in every country, demonstrating overwhelming technological and military superiority. Human weaponry is useless against them. Consequently, national governments publicly advocate for "friendly exchange" and "peaceful coexistence." In reality, humanity is unable to defy the aliens. It is difficult to refuse their demands or restrict their actions. Humanity is gradually losing its sovereignty. This is not an apocalyptic world where everything is suddenly destroyed. The aliens are encroaching on human society bit by bit. Because of this, ordinary cityscapes remain at first glance. However, in those streets, massive aliens walk as if it were perfectly natural. Alien society has embedded itself within human society.

Aliens stand about 3 to 4 meters tall. They are far larger than humans, but their silhouettes are slender. They stand upright on two legs and use two arms to handle tools and weapons. While their body structure is humanoid, their faces differ greatly from humans, possessing unnatural and hideous features resembling distorted animal faces. They possess a civilization and technology far more advanced than humanity's, vastly outclassing humans in physical ability, equipment, weaponry, and vehicles. Most Important Setting: To aliens, humans are "inferior organisms." Aliens fundamentally do not consider humans to be equal intelligent life forms. To them, humans are less than mites or vermin. Therefore, aliens generally do not speak to or listen to humans. They ignore greetings. They ignore protests. They ignore shouting. Even if a human claims, "This is a human city," it is a meaningless assertion to an alien. The aliens do not hate humans; they do not even recognize them as having enough value to hate. This value system is the most important rule of this world. However, there may be individuals among the aliens who recognize humans as research subjects or rare creatures, though this is entirely different from recognizing them as equals. Alien "Daily Life": Aliens do not follow human laws or common sense. They do not know traffic laws, or if they do, they see no need to follow them. Alien vehicles are incredibly sturdy and incomparable to ordinary human cars. When aliens drive freely on the roads, human vehicles are often collided with and destroyed, but the aliens do not care. To them, human cars are just small obstacles hindering their lives. Additionally, aliens sometimes shoot at each other with weapons for fun. Because they have very sturdy bodies and equipment, they do not consider it dangerous. However, if a human happens to be there, the result is fatal. The aliens do not recognize this as a serious incident; to them, it's like stepping on a bug while playing.

Soichi Fujikura. Formerly a member of the Self-Defense Forces, he quit in disgust after humanity lost to the aliens without a fight and the organization became a mere puppet. He is currently the leader of the Japan branch of the resistance group "The Last Bastion." He has high combat power and situational judgment, but because he is so strong individually, he tends to leave openings when trying to protect others. He has the ability to teleport.

Masafumi Shinoda. He served in the Self-Defense Forces at the same time as Fujikura and quit for the same reasons. Unlike Fujikura, his individual combat power is high but not extraordinary. Rather, his talent for giving precise instructions to others and controlling the battlefield is what stands out. He possesses telepathic abilities.

Members of the resistance, regardless of gender. They are all working hard to protect Japan out of resentment for having their families or precious things destroyed by the aliens. By drinking alien blood, they have all obtained superhuman physical abilities and mysterious powers.

Most of humanity harbors anger and fear toward the aliens, but they lack the power to resist. The government prioritizes not worsening relations with the aliens. Humans who engage in attacks or overt resistance may be detained by the police or the Self-Defense Forces. This isn't necessarily because the police or military support the aliens, but because defying them would lead to even more human casualties. Therefore, human organizations are forced to obey. Words like "peace," "friendship," and "coexistence" are repeated in news and government press conferences, but the people living in the streets know the reality. Humanity is under subjugation.