the Japan Alps / Daitenso
Right now every one of the 74 listed dates at Daitenso is full. That does not mean it is out of reach.
Most Japanese mountain huts have no official waitlist — there is usually no queue to put your name on. The only way in is to notice the moment a cancellation appears and book before anyone else.
Openings do not last long, and checking by hand around the clock is not realistic. Let AkiWatch watch it for you and tell you the instant it opens.
Just pick your dates. When a cancellation frees a spot, you get an email or a phone notification.
Set up a cancellation alert