Rei had done everything asked of him and he couldn't even return home. Bitter and depressed, he considers ending it all, but stumbles upon a wounded Volo. Against his better judgment, Rei decides to help him.Meanwhile, Laventon discovers that he is being summoned back to Galar in order to prove his hypothesis on environmental evolution. Taking Akari, Adaman, and Rei (and by association, Volo), as companions, he sets off on a journey to many different regions to prove his work.