Kazuhiro Kitase has spent years slipping between modern Japan and a fantasy world in his sleep, building an unlikely friendship with Mariabelle, an elf mage who assumes the two worlds are simply one continuous reality. When a dragon attack pulls Mariabelle across the boundary into Japan, Kazuhiro finds himself playing tour guide to someone experiencing Tokyo's streets, food, and rhythms for the very first time. The series blends isekai adventure with a grounded, curious look at everyday Japanese life through the eyes of a genuine outsider.