35-year-old Nao Suzuhara (Yasuko Matsuyuki) wanders alone in the north. It seems that for some reason, she has never returned home in the past 10 years. Nao likes to observe birds, but she became an elementary school teacher by mistake. During this period, she met a 7-year-old girl, Michiki Reinan (Aina Ashida). Reinan has unique ideas and a cheerful personality, but she has no friends around her. She grew up in a single-parent family, where her mother lived with her lover and lived a lonely and dilapidated life. Reinan's eccentricity and the scars she accidentally found on her body attracted the attention of Nao and the school. They realized that the little girl was suffering from abuse from her mother. After several twists and turns, Nao's maternal instinct was aroused. She decided to "abduct" Reinan and take on the responsibility of being a mother. On that snowy day, Nao and Reinan disguised themselves and agreed to leave the cold north and set off to find a warm and happy home...