She is the landlady of the Inn of Lost Things, helping visitors in their search. Although seemingly cold and blunt, she cares deeply about the guests that visit the Inn.

Spoiler

It is later revealed that the inn serves as a place for lost souls looking for peace of mind after death before moving on. Its workers are lost souls who have yet to find rest, and Okamisan has been there the longest due to losing all memories of her life and therefore being unable to remember what she has lost.