Kagari is a teenage girl with brown eyes and shoulder-length brown hair, possessing a slender build fitting her youth. She works as a cartographer in Hakoniwa, a labyrinthine mining town known as a "miniature garden" for its perpetually shifting layout. Her profession involves navigating newly formed tunnels, pathways, and urban configurations daily, selling updated charts to survive. This risky mapmaking business is essential for providing accurate navigation in the unstable geography.

Her childhood friend, Yuya, shares the mapping occupation but dreams of leaving Hakoniwa entirely. Their relationship is central, marked by the contrast between Yuya's desire for escape and Kagari's ongoing dedication to documenting the town.

Kagari's daily life collides with broader events as mysterious sinkholes and cave-ins plague Hakoniwa, hinting at a hidden conspiracy threatening the town. These events draw her into unfolding conflicts. The town itself is a hazardous environment of claustrophobic underground networks, gang activity, and retrofuturistic mechanical elements. Her experiences reflect themes of adaptation and resilience within this unpredictable setting.