Set in the bustling heart of Tokyo, the story follows eight-year-old Itsuko Toka, a proud and self-assured third-grader who lives with her family near Shibuya Station. A true city native, Itsuko is deeply devoted to the concept of Shibuya style and attitude, which she calls Shibuyakan. Her life takes a turn when her homeroom teacher, the substitute instructor Hiroshi Torii, appoints her as the first class chief of the Shibuya Committee, tasking her with embodying and promoting the neighborhood's unique essence. Torii himself is a newcomer from the countryside who is almost comically obsessed with everything he perceives as sophisticated urban culture.

Itsuko navigates the quirky social landscape of her school, surrounded by eccentric classmates. These include Eru Nishinigame, a cynical and mature returnee from New York; Misaki, a girl from a large family living in tight quarters; and the aristocratic Mio Rothschild, who openly looks down on others. The story balances Itsuko's school adventures with a portrait of her home life, featuring her often-unemployed otaku father Ijin, her stern and knowledgeable mother Inori, and her sweet-natured younger brother Isumi.

The narrative unfolds through a series of short, mostly self-contained chapters that blend heartwarming family comedy with the author’s characteristic satirical edge. The series uses its Shibuya setting to explore themes of modern urban living, contrasting native city-dwellers with those who aspire to the culture. Notable early arcs establish Itsuko’s role as the Shibuya leader and the arrival of her unusual classmates. Later chapters continue to delve into the everyday absurdities and small crises of the Toka family and their community, from school festivals to the mundane challenges of parenting in the city, all chronicled in an ongoing fashion.