Kaiju Princess is a visual novel designed exclusively for adult audiences. The events take place in a fantasy universe, drawn in beautiful and beloved anime graphics. The main character is an ordinary office employee with a rather boring life. Suddenly everything changes dramatically – he meets a girl who definitely needs help. She is incredibly beautiful, and therefore the protagonist decides to invite her to his home and give her a roof over her head completely free of charge.

From this moment on, the protagonist of Kaiju Princess begins to regularly engage in sexual relations with the beauty, which definitely pleases him, because life has finally acquired color. However, over time it turns out that the stranger is an alien, capable of summoning huge creatures at the will of his emotions that can destroy an entire city without any problems. The gamer's task is to have as much fun as possible, but at the same time control the goddess of love and prevent her from summoning monsters.

The gamer will spend most of the time in dialogues, as well as in sexual scenes, in which you can also take various actions – choose a position, toys for intercourse, and so on. Also, the girl can be dressed up in numerous outfits for role-playing games. There is absolutely no hint of censorship in the novel, and therefore it is practically indistinguishable from an animated pornographic film.