Can foreigners start NISA / iDeCo in Japan? Thinking about the future

With prices climbing and the yen being the yen, I've started wondering about saving/investing while I'm here. Heard about NISA (tax-free investment) and iDeCo but wasn't sure if foreign residents can use them. From what I gather, yes if you have a 在留 + My Number + a Japanese brokerage account. But: ・what happens to NISA/iDeCo if you leave Japan? ・is iDeCo locked until 60? Anyone here actually using these as a foreign resident? Would love real experiences before I jump in. Not financial advice, just curious 📈