Tokyo started as a fishing village called Edo and became the seat of the Tokugawa shoguns in 1603. By the middle of the 18th century it had more than a million people. It was renamed Tokyo, "eastern capital", when the emperor moved in after 1868, and it was flattened twice in the 20th century, by the 1923 earthquake and by the bombing of 1945. That is why the city feels so new. Almost nothing is old, and the things that are old are cherished like heirlooms.
Tokyo is not one center but a ring of small cities, each with its own station, its own crowd and its own personality. Asakusa is the paper-lantern past, Shibuya is the teenage future, Shinjuku is neon and tiny bars, Ginza is department stores and fish. Five days is the right length because it lets you spend one day in each of four areas and still leave one day for a trip out. The trains make it work.
The plan runs by area. Day one is Asakusa, Ueno and Akihabara, day two Meiji Jingu, Harajuku and Shibuya, day three Shinjuku, day four a day trip to Nikko, and day five the imperial palace, Ginza, Tsukiji and teamLab. Start on a Tuesday if you can: the museum is closed on Mondays, the palace gardens on Mondays and Fridays, and Nikko is better on a Friday than a weekend. The plan works in any season: the notes say what changes in winter, when the days are short and the shrines close early, and they flag the rules that changed in 2026. For the country as a whole, see Japan.