Niseko's most famous noodle shop is also famously hard to find, though its secluded location (accessed via a wooden boardwalk) is a big part of the appeal. The other part is watching chef Tatsuri Rai behind the counter hand-make the soba (buckwheat noodles) you just ordered. Simple is best: go for the namako uchi seiro (生粉打ちせいろ; fresh-made cold noodles) – just ¥900.
Rakuichi is known to draw huge lines for the first lunch seating at 11.30am (it stops serving lunch when it runs out). So unless you're willing to commit a lot of time, this is one for the low season. Dinner is reservations only, but lunch is better. It's off the access road to Annupuri; look for the banner. No children under 12.