Gimon is a supernatural entity resembling a large, plush toy-like creature with the unsettling visage of a creepy alien, serving as a guide within the World Border, an alternate dimension. It initially appears in the human realm as an inanimate plush toy and a digital cartoon avatar on a messaging app, but within the otherworldly realm, it gains sentience and speaks with dual vocal traits—an elderly, masculine tone layered over a youthful, feminine timbre.

Tasked with orienting human visitor Mio to the World Border’s enigmatic laws, Gimon navigates her through its trials, mediating interactions with entities like a bureaucratic lost-and-found officer and an ethereal goddess to reclaim her fragmented memories and resolve to return home. It allies with companions Kiku-chan and Arata to subvert obstacles set by the realm’s guardian, ensuring Mio’s safe passage back to her world.

Rooted in Mio’s human life as a cherished fictional creation, Gimon bridges her mundane reality and the fantastical realm. It embodies her imaginative pursuits while operating as a pragmatic guide, anchoring her journey through the supernatural with familiarity drawn from her own aspirations and affections.