The player plays a general office worker, life is nothing new and exciting. One day, the man left a message on the homestay website. This website is specially designed for homeless women. However, the woman who came to the boarding house was a person with strange clothes and claimed she was the princess of Kaiju. The player will have one deal with this girl. In this period, the player will provide shelter and life needs, and the mysterious girl will reward player with intercourse. Unfortunately, after living together, the player will find that the woman is an alien invader. She can summon kaijus and command them. Even if we expel her, there will still be other invaders coming again. Our only chance to save the planet is assisting her meet the minimum destruction requirements. So we volunteered to be her supporter. In the limited time, minimize damage in our city and death. However, we need to avoid tracing by government organizations and meet the minimum requirements for injury. Don't forget, the last and most important part ----- a happy and exciting cohabitation life with her.​