The series is about during the Edo period, within the Fukagawa ward of old Edo (present-day Tokyo). Because the world is susceptible to fire and flooding, residents rent everyday items like pots, futons, and clothing from shops rather than purchasing them, so as to not impede them once they flee. Obeni and Seiji, an older sister and younger brother, run one such rental shop called Izumoya. However, mixed in with their inventory are tsukumogami, objects that have became spirits after 100 years of existence. The siblings sometimes lend these sentient items to customers. Both Obeni and Seiji can see and ask these spirits, and other tsukumogami often come to the shop after hearing of the famed siblings.