Pokemon still at top spot (of course). Luigi's Mansion at #2. I did not see that coming. I did not realize just how popular Luigi's Mansion is. I've never played a Luigi's Mansion game, so I guess I need to give it a try. Then there is this Fishing Spirit game. Apparently this is popular enough to top BotW, Fire Emblem, Dragon Quest XI S and both the 2D & 3D Mario platformers. That was a game not even on my radar, but apparently the Japanese really love it.
Switch dominates the top 10 in spite of all of the PS4's sold this week. It will likely last that way for the rest of December.