Living in an unconventional house attached to a building, Milk-chan navigates life with her quirky companions: Tetsu-ko, a bottle-shaped paranoid robot, and Hanage, a moustached green blob. Struggling with rent, Milk's failed attempt to extort an ant family adds to her financial woes until a surprising offer from the president himself lands her a secret mission. Answering calls with a playful ruse, Milk-chan embarks on missions aboard the 'Milk-6' helicopter with her sidekicks in a humorous nod to classic spy thrillers and Bond films.