Becoming Japanese

Depending on the country, sometimes the Japanese naturalization procedures require you to renounce your former citizenship(s) after acquiring Japanese citizenship -- within two years. This is for countries like New Zealand and the United States. However, For most countries, such as South Korea, the United Kingdom, and the People's Republic of China, Japan requires you to renounce/legally abandon your former nationalities prior to receiving Japanese naturalization. Note that they won't ask you to do this until they've confirmed that every other detail of your application process will pass the requirements, so there's no risk of you renouncing your citizenship and then finding out that you won't be receiving Japanese citizenship. Even so, some countries have a "safety boomerang" clause for their renunciation procedure. For example, if citizens of the United Kingdom renounce their citizenship but do not manage to acquire another citizenship within six mon...