Niseko was farming country before it was a ski town. Hirafu's first lifts opened in 1961, Annupuri followed in 1972, Niseko Village (then called Higashiyama) in 1982 and Hanazono in 1992, and in 1993 the four got a shared pass that was valid on all lifts by 1998. The name comes from the Ainu word for the Nisekoanbetsu River, river toward the cliff. What turned a Hokkaido farm district into a global powder destination is a weather pattern, not a developer: cold continental air crosses the Sea of Japan, picks up moisture and dumps it on the mountain as light, dry snow.
The skiing is real, but so is the packaging. Grand Hirafu is a resort town built for visitors from abroad, with English menus, rental shops and condos in every direction, and it fills up at Christmas, New Year and Chinese New Year. Prices rise with the crowds, and good restaurants are booked weeks ahead. Kutchan, eight kilometers down the road, is the actual Japanese town and the cheaper base. Five days is the right length because it gives each of the four areas its own day on one consecutive All Mountain Pass, with a fifth day for Otaru, a harbor town of canals, sushi and glass.
The plan runs Monday to Friday: Grand Hirafu on Monday, Hanazono on Tuesday, Niseko Village on Wednesday, Annupuri on Thursday and Otaru on Friday. Start on a Monday if you can. It keeps your pass days on weekdays, and Otaru's shops, sushi counters and the LeTAO cafe (which takes seat reservations only on weekdays) work better on a Friday than a weekend. Rusutsu, Moiwa and Kiroro are in the extras at the end. Read the Japan page for the country basics. Prices are in yen with euros in brackets.