Mori Obaa-chan embodies a divine presence in the World Border, a metaphysical plane reached through traumatic passage. She oversees a candy shop once frequented by the protagonist in childhood, weaving her into the fabric of nostalgic longing. Beyond confections, she administers the Forgotten Things Counter—a repository for misplaced memories and objects—where visitors must vocalize their buried histories to reclaim what was lost.

Her essence mirrors Amaterasu, the Japanese sun deity, infusing her design and purpose with celestial symbolism. As guardian of the threshold between life and the afterlife, she shepherds souls in transition, balancing their passage between realms. Her guidance targets those adrift in displacement, challenging them to grapple with unresolved emotions and fragmented memories as a path to reclaim autonomy.

Encounters with her demand reconciliation of fractured relationship memories, particularly those marred by silenced sentiments or lingering strife. Through deliberate introspection, she compels seekers to face concealed truths, dismantling the barriers that bind them to liminality. Her narrative remains anchored to these core functions, with no documented extensions into other media.