Japan has a law against dual citizenship. After age 22, you are supposed to choose one nationality and renounce the other. This is clearly stated in the Nationality Act.
It is also, in practice, almost never enforced. Many Japanese nationals quietly hold two passports. Authorities generally don't look too closely unless something forces the issue. Everyone involved knows the rule exists. Everyone involved behaves as though it is optional. And the system keeps running smoothly.
To a Western legal mind, this looks like hypocrisy, or at best inconsistency. To a Japanese mind, it's just how things work. There is the official position — tatemae — and there is the practical reality — honne. Both exist simultaneously, and navigating the gap between them is a basic social skill.
What tatemae and honne actually mean
Tatemae is the public face: the official rule, the stated position, the version of reality that everyone presents in formal contexts. Honne is the genuine feeling or actual practice underneath. In Japanese social life, both are real. Neither is exactly a lie. They operate in different registers.
The dual citizenship situation is tatemae and honne in its purest form. The law exists because Japan officially values single nationality — that's the public principle. But enforcing it rigidly would create real hardship for returnees, mixed-heritage families, and people who built lives abroad. So the practical reality is flexibility, handled quietly, without anyone having to formally change the rule or publicly admit the gap.
Where foreigners go wrong
Most friction between foreigners and Japanese institutions comes from expecting only one layer. A Western businessperson reads a contract, assumes it captures the full agreement, and is then baffled when Japanese counterparts behave as though unstated understandings also apply. A foreign employee raises a concern formally in a meeting, expecting direct engagement, and gets polite agreement that leads nowhere — because the real decision-making happens through a different channel entirely.
The Japanese side isn't being deceptive. They're operating in a system where the formal layer and the practical layer are both legitimate, and where a socially competent person knows which one applies in which moment. The foreigner is simply missing half the operating system.
The trade-off
The tatemae-honne system has real advantages. It allows face-saving exits from awkward situations. It lets rules exist as aspirational standards without requiring rigid enforcement that would produce unfair outcomes in edge cases. It keeps social surfaces smooth.
The cost is opacity. When the gap between the official story and the practical reality becomes too large — when tatemae stops being a polite softening of honne and starts being a complete fiction — the system loses its capacity for honest self-correction. Nobody can address a problem that nobody is officially allowed to name. The dual citizenship law is a benign example. The same mechanism, applied to institutional failures, is considerably less benign.