Wako Kishi lives in the Asagaya Apartments complex with her younger brother Shingo Kishi, her mother Mifuyu Kishi, and fellow residents including Yuma Sawatari and Ginnosuke Tadokoro. A fifth-year elementary school student and Shingo's older sister, she is nicknamed "Wakosuke" by Yuma and Ginnosuke. Outwardly sociable with many friends, Wako internally grapples with anxiety about others' opinions of her, leading to compulsive behaviors like constantly checking her social media accounts. She watches Shingo, Yuma, and Ginnosuke regularly play video games together in the same group dynamic, a sight that both baffles and amuses her. Wako frequently teases Shingo and his friends about their unwavering gaming habits.