It’s no secret that Japan’s birth rate is declining. Recently, the Tokyo government announced that it would launch a dating app to address the issue, at least within the capital. The announcement quickly went viral, but the app joins a long lineup of dating apps in Japan. Whether or not this app will succeed in getting more singles in a city of millions of people to marry remains to be seen. But there’s no need to wait for the launch of this app to start dating in Japan. If you’re single and looking for a serious relationship, something casual or even just to meet new people, there are a varie…