Yukiko Koshigaya

Yukiko Koshigaya serves as the devoted mother of Suguru, Komari, and Natsumi, and shares a personal connection with Asahigaoka Branch School as a former graduate. Managing the household with unwavering dedication, she holds her children to high standards—particularly when it comes to Natsumi's mischievous antics and academic performance, which often bring out her formidable authoritative side. Beneath her stern exterior, however, lies a deeply loving heart that extends not only to her own family but also to the neighborhood children around her. She is, without question, the cornerstone that keeps the Koshigaya family together.