In a future not far off, Nuku-Nuku crashes into the Natsume household and becomes a part of their lives. Struggling with amnesia, she assumes the guise of the lovely Atsuko Higuchi, captivating everyone with her beauty and culinary skills, especially the 14-year-old Ryunosuke. But as she integrates into Maneki City, a string of enigmatic events unfolds - experimental contraptions going berserk, fighter jets thundering overhead, and widespread chaos gripping the urban landscape. Each calamity is marked by the presence of a mysterious girl, hinting at connections beyond mere coincidence.