I’ve done a bit of research and seen the summaries of the regulations and rules in Japan https://drone-laws.com/drone-laws-in-japan/
However, I’m curious if anyone has any recent experience about flying DJI drones in Japan? Do you need to do anything before you’re allowed to take off in Japanese airpsace?
well if you research then you would of come across what you would need to do i asume? check there airspace regulations, see if tourists are excempted etc as some places like hong kong say that to a degree 
Yes, as I mentioned I have done this.
I’m asking if there are any DJI hard locks.
Moved the topic to the Travel section where others might see it who have flown there.
Thanks. So according to that just regular airspace?
I have no idea what you mean by that.
You asked …
… and I provided a link to the DJI Geozones that includes any areas DJI lock.
By “airspace” I mean Classed Airspace.
Firstly every drone over 100g in weight needs to be registered and labelled.
Also every drone in that class required remote ID either via built-in or a third party add on unit.
Once you’ve done that you can fly according to the laws (no built up areas, daytime, VLOS, 30m from all people and property).
Registration is via this site:- (its got good English, a good PDF English walkthrough and even tutorial videos).
Its a fairly simple process - you need to scan your passport, enter drone serial, wait a few days for payment link, pay the fee (about 1200 yen) then wait a few more days for approval.
UAS rules are here: https://www.mlit.go.jp/koku/content/001465740.pdf
Flight plan must be filed and restricted airspace can be found here:
https://www.uafpi.dips.mlit.go.jp/fpl/?lang=en
Not all built up areas are no-go zones so thats pretty much all the cities (地理院地図 / GSI Maps｜国土地理院)