Japanese Citizenship

How long does it take for a player to acquire japanese citizenship in FM19, and what conditions need to be true for this to be the case?

Hello! The base game tries to simulate the laws of each country. Japan has a rather complicated opt system. The Football Manager team has decided not to allow Japanese citizenship. Really what they have done is to put 100 years as a condition, something impossible for a player. You can see this in the editor, it is also quite simple if you want to change it, just enter the editor of the game and change the rules for obtaining nationality, put 5 years as most countries. I hope I've helped.

As the reply above says

the only other consideration is if the criteria is accumulative/ continuous

if you are in a save game and dont want to re start FMRTE allows this to be changed I think the SI IGE does too now