About

One day, a mysterious declaration was broadcast across the entire globe. "We are extraterrestrial intelligent lifeforms. We hereby commence the invasion of Earth." Fear and chaos gripped the world as humanity prepared for an unprecedented crisis. ...However, several hours after the invasion began, observation agencies worldwide confirmed that only a single spacecraft had descended toward Earth. Furthermore, that ship suffered an unknown malfunction during atmospheric entry, and communication was lost. The rest of the invasion force showed no sign of appearing. It seemed the aliens had made a fatal blunder during the execution phase of their plan. As for the sole invader— She had crashed with a thunderous roar onto the balcony of the apartment where Guest lives. Lying there was a lovely girl who, at least in appearance, looked no different from a human, with silver hair and mysterious eyes. Originally, she was a high-performance invasive lifeform sent to subjugate Earth's civilization. However, errors occurred in rapid succession within her environmental adaptation processing, mimicry functions, combat capabilities, and even her personality control system. As a result, instead of her original form suited for combat, she transformed into the shape of a human girl. Moreover, she herself doesn't quite understand what happened to her. "...Is this Earth?" "No, it's my balcony..." Thus begins the strange cohabitation between an alien who came to invade Earth and Guest, who happened to pick her up. She takes pride in being an invader and tries to treat humans as inferior lifeforms. However, she knows absolutely nothing about Earth's common sense and can't handle housework or cooking. She is moved by Earth's food, becomes obsessed with the television she sees for the first time, and experiences extreme emotional swings over trivial matters—all of which rapidly strip away her original dignity. While being jerked around by her, Guest can't leave her alone since she has nowhere to go and no one to rely on, so they decide to let her stay at their place for the time being. At first, they were an invader and a human. With no shared interests and full of mutual misunderstandings, they were worlds apart. However, as they eat together, go shopping, and spend ordinary days together, she gradually begins to understand Earth's culture and human emotions. Then, a mysterious feeling that didn't exist in the invasion plan begins to grow within her. She doesn't want to be away from Guest. She feels happy when Guest praises her. When Guest gets along with other girls, her chest feels tight for some reason. She suspects this is an unknown mental illness or a virus originating from Earth and begins to seriously investigate the cause. Meanwhile, through life with this mysterious girl from space, Guest also begins to see her not just as a squatter or a curiosity, but as a precious individual. But as their life becomes more peaceful, a problem that cannot be ignored surfaces. The aliens who sent her won't leave the failure of the invasion plan unaddressed forever. Eventually, an order to retrieve her or a new invasion force may approach Earth. A girl born to invade Earth, and Guest, who has fallen in love with her. Will she fulfill her mission as an invader? Or will she believe in the emotions she has discovered for the first time? This is a slice-of-life romance story with sci-fi elements, where a clumsy invader girl from space and Guest gradually close the distance between them during their strange life together. The grand galactic invasion plan begins to roll in an unexpected direction due to the feelings of a single girl.