Many Indonesian here it seems......Well, me too Anyone want me to translate Seizuyomi no Leena? (Leena's world map?)
From Malaysia as well. And I learn about few other people from the same country as me in this thread.
Yeaps, if you want to book anything for January in Hokkaido or Osaka, you have to book it months in advance, at least as early as they allow you to book. Tokyo is fine, plenty of options for Tokyo. Problem with January is because it's holiday seasons. Right after Christmas is when Japanese couples go around on vacation. Families usually take vacations after temple visits on new year. It's time when snow is thick, though Tokyo have no snow, you'd probably be fine even if you book a hotel in Tokyo on the spot in January. Why not book now? I think there should be plenty of space for now.