Her full name is Ijiwaru Ishi, though she is commonly called Ijiwaru Baasan. This elderly woman exhibits a notoriously mischievous and self-serving nature. Her primary focus involves playing pranks on others. She may occasionally assist people, but only when it serves her own benefit or personal satisfaction. Her activities extend to social engagements like dating and pursuing vengeance against men she believes have wronged her.

Managing her volatile nature proves challenging. Family members take rotating responsibility for her care, regularly transferring this duty to a care facility. This dynamic underscores broader societal themes related to elder care within an aging population, framed by her disruptive influence.