A and Un are familiars created by Inari and inherited by Koto. Their names signify "the beginning" and "the end," reflecting their symbolic roles. They appear as chibi middle school students dressed in black blazers over red hoodies, black pants, and black shoes. They can transform into red and blue monsters capable of flight and supernatural strength.

A exhibits a hyperactive personality, contrasting with Un's reserved demeanor. Koto collectively calls them "Ah-un." They accompany her journey to find a black rabbit and return home, offering companionship and assistance.

Beyond companionship, Kurama uses them as hostages to force Koto into activating the adamantine giant Bishamaru to open a dimensional gateway. This act compels Koto into a confrontation that escalates the siblings' conflict over their family's fate.

As Inari's familiars, they embody the concepts of inception and conclusion. Their presence underscores the narrative's exploration of creation, legacy, and cyclical renewal.