Nikko to Ryuzu Falls in December

Hi, I am planning to go visit Ryuzu Falls from Nikko on Dec 13th - however, while found the bus times till end of November, no matter what I try (maps, navitime, https://www.tobu-bus.com/) I can't find anything for December. Can anyone shed light on the matter, and how to find this info? I mean it should be completely impossible that there is no bus servicing this area in December, right?

Thanks in advance!

There is a timetable change, but it seems Tobu has still not posted the new timetable to their website. How user-unfriendly! But don't worry, buses will also run relatively frequently in the winter.