Soon, the Natsume family took in Nuku-Nuku, who appeared at their home one day in the not-too-distant future. Suffering from memory loss, she went by the name Atsuko Higuchi and impressed 14-year-old Ryunosuke with her cooking abilities and stunning looks. However, bizarre events began to occur in Maneki City after Nuku-Nuku's arrival, such as technical contraptions breaking down, fighter planes flying perilously low, and damage to the city. On each occasion, a mysterious girl was spotted at the site of the mishap.