As Likebike alludes to, the requirement for living in Japan isn't having a certain amount of money, it's having a visa. Yes, most visas will also require you to show that you'll have financial support while living in Japan (either your own savings or someone who will cover your expenses), but the process is not as simple as saying "I have enough money" and getting a visa based solely on that.
In broad terms, there are four types of visa: 1. Student visa: This means that you are a student of a school based in Japan (i.e. you can't get a student visa to live in Japan while attending online classes for an American university). In order to get a student visa, you would need to apply to and be accepted by a school in Japan.
2. Work visa: As with the student visa, to get a work visa you would need to apply for and obtain a job in Japan.
3. Spousal visa: This visa is for spouses of people who are living in Japan. Japan does not offer visas for fiances or girlfriends/boyfriends, though, so to obtain a spousal visa you would have to marry your boyfriend.
4. Child of Japanese citizen visa: There are special visas for the children of Japanese citizens, even if the child is not a Japanese citizen themself. However, since you're asking your question on this forum, as opposed to asking your parents, I'm guessing that neither of your parents is a Japanese citizen, to this wouldn't be an option for you.
So at this point, if you're set on living in Japan, you'll need to decide if you're going to enroll in a Japanese school, look for a job in Japan, or marry your boyfriend.
Bear in mind, though, that not all jobs are eligible for visas, so obtaining a work visa is not as simple as just finding any job. An entry-level job in a restaurant, convenience store, or retail shop, for example, will generally not qualify for a work visa. Because of that, if you decide to try to move to Japan on a work visa, you might be best off waiting until after you graduate from your college in the U.S., since finding a visa-eligible job in Japan is much easier if you have a college diploma.
Also, if you'll forgive me for a bit of unsolicited advice, you mention that you and your boyfriend have been together for about a year and that you "don't have a passport yet." From that I'm guessing that you have never visited Japan. Since regardless of which visa route you take the visa will take time to obtain, I would strongly recommend that before moving to Japan you obtain a passport and go to visit the country first. Japan is, in many ways, a very nice place to live (I moved to Japan from the U.S. after graduating from college and have now lived here for more than 20 years). However, Japan is not a perfect country, and not everyone who likes certain aspects of Japanese culture/society will actually enjoy living here day-in and day-out.
You mention that your boyfriend was going to school in Sapporo and has now moved back to his hometown, from which I'm guessing that his hometown might be somewhere smaller than Sapporo. If so, that's all the more reason to go visit at least once before you decide to move there. Country living in Japan brings its own unique set of quirks and challenges, which some people enjoy and some people don't.
And to be clear, I'm not saying "You'll probably hate living in Japan, so give up on being together with your boyfriend!" Visiting the country and his hometown before making a long-term commitment to live there, though, will help you and him understand whether that's the best place for you to live, or if there's somewhere else that you'll be happier living together.
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