In Edo-period Japan, the series revolves around Seiji, a young man who manages a pawnshop called "Izumoya" with his adoptive sister, Oko. The shop specializes in renting out everyday items, but these items are no ordinary objects—they are tsukumogami, tools and artifacts that have gained spirits after a century of existence. These tsukumogami possess unique personalities and abilities, often causing mischief or aiding their human companions in unexpected ways. Seiji and Oko act as intermediaries, helping both the tsukumogami and their human clients resolve conflicts and misunderstandings.

The narrative unfolds episodically, with each episode focusing on a different tsukumogami and the challenges they face. The tsukumogami range from a mischievous tea kettle named Okou to a protective umbrella spirit, each with distinct traits and backstories. Seiji, with his calm and resourceful demeanor, often mediates between the tsukumogami and their human counterparts, ensuring harmony and understanding. Oko, on the other hand, is more impulsive and emotional, providing a contrasting dynamic to Seiji’s composed nature. Together, they navigate the complexities of human and tsukumogami relationships, blending humor, drama, and moments of introspection.

The series also delves into the cultural and historical context of Edo Japan, incorporating elements of folklore and traditional beliefs about objects gaining sentience. Themes of coexistence, respect for the past, and the value of empathy are woven into the narrative, as the characters learn to appreciate the interconnectedness of humans and the spirits inhabiting their world. The episodic structure allows for a variety of tones, from lighthearted and comedic to poignant and reflective, creating a balanced exploration of the tsukumogami mythos. Through its focus on the interactions between humans and spirits, the series offers a unique perspective on the bonds that transcend the material and the spiritual.