Obaa, the grey-haired grandmother of the Kyan family, runs the "Kame Soba" soba shop in Okinawa. She lives there with her three granddaughters, Nanafa, Nao, and Kokona, serving as the household's primary caregiver and matriarch. Obaa maintains the family business and oversees daily restaurant operations, often styling her grey hair in buns.

She demonstrates notable physical capability and decisiveness. When spirits disrupt Kokona's school Sports Day, Obaa intervenes without hesitation, drop-kicking them—an action met with applause from onlookers. This exemplifies her role as a stabilizing force during supernatural disturbances affecting her family.

Her knowledge includes traditional Okinawan practices, such as creating a potent special snakebite home-brew remedy. Professor Chura consumes this brew entirely without adverse effects, confirming its efficacy. While not directly stated to perceive spirits like Kokona, her actions acknowledge and address supernatural occurrences impacting the household.

Her portrayal remains consistent as the practical anchor within the Kyan family dynamic.