Haruka Sawatari is Yuma Sawatari's mother and Ryo Sawatari's wife, frequently working night shifts while depending on the household AI Autobot Nanako to oversee domestic duties and sustain the family's daily routines. Though she appreciates Nanako's housekeeping support, Haruka wrestles with her son's unwavering resistance toward the robot. She witnesses the tension between Yuma and the Autobot, uncertain how to resolve their discord.

Haruka shares a childhood friendship with Ryo and Yoshitatsu Kawai, the latter being Honoka Kawai's father and a novelist who once nurtured unreciprocated romantic feelings for her. This past bonds their families, yet Haruka remains steadfast in her commitment to Ryo. Juggling work demands and motherhood, she navigates complex relationships while quietly bolstering Yuma through his experiences.