Naoto, curious about his distant stepsister Yui, downloads a mysterious app called "Navi Fox" that promises to reveal everything about the girl of his dreams. To his shock, the app transfers his consciousness into Yui's body, allowing him to experience her sensations firsthand. This supernatural connection leads to a forbidden encounter between the two, leaving Naoto questioning the true power of the app.
After using his possession app to manipulate classmates and uncover Arisa's secret life, the protagonist is confronted by the former god who granted him the power. Refusing to surrender the app, he attempts a daring possession of the deity herself. By introducing the god to the heights of human pleasure, he successfully swaps souls with her, securing a divine body and an endless pursuit of desire.