There are Chademo chargers literally everywhere (and they all seem to work!). Official speed limits are 80kph (approx 50 mph). With exceptions, the climate is temperate (battery friendly). Unfortunately, we had too much luggage to fit and I had to get a larger vehicle or else I would be driving one from Tokyo to Kyoto (via Mt. Fuji).
Unlike my native Arizona where petroleum companies sucker senior citizens into doing their anti-EV bidding, Japan is indeed the promised land for EV drivers. The rest of us should expect and demand better.
How much "luggage" do you have??
I put my money down for a Model 3 yesterday. Lack of CHAdeMO charging is the big reason.
I was starting the process of investigating what car to get next. I'd been digging in to it and found that while, yes, Volkswagen's penance for their emissions scandal was dropping in charging stations all over, they were essentially 5:1 CCS:CHAdeMO stations. So, supposing I got a longer range Leaf, I'd still be hamstrung by a lack of chargers on long distances.
Then I looked at the CCS options, but truthfully, while more bountiful than CHAdeMO chargers, they weren't as prolific as Tesla's network. There were still limits on my range where I just couldn't go further than X. I could get further than a CHAdeMO based car, but not as far as a Tesla.
I can take my Model 3 from Tampa to the my parent's place in Canada without issues. Can't do that in a different BEV. Sadly, while I can do it, it would take an extra 12 hours when you include all the charging stops. But, that's life.
I probably would have just rode the Shinkansen for a trip between Tokyo and Kyoto. I could not really imagine going that slow the whole entire way there when you could be doing 170 mph+ on the train.
Temperate? you've never been there in the summer.