Yukie Kokuhō is the younger sister of Kenichi Kokuhō and a member of the Kokuhō family, living with her father Kenkichi, older brother Kenichi, and younger brother Kenji. She grounds the comedy as the straight man, responding to Kenichi's unconventional behavior and wild demeanor with grounded reactions. Her role involves navigating the disruptions caused when Kenichi, raised in the mountains by his foster father Cha Genmai, returns to his biological family at age 15, exposing her to his unfamiliarity with societal norms and technology.