Vivinavi

Question about passports.

I became an American citizen and returned to Japan with a Japanese passport and am currently in Japan.
I returned my Japanese passport and now have only an American passport.
I am going back to the U.S. soon, but I am buying a ticket, and I will be back in Japan
within 3 months.

So here is my question.

From Japan, when I buy a return ticket （ within 3 months ） and leave Japan, will I come back to Japan again ？ or will I be told that I do not have a return ticket? When you go to the U.S. one way and come back to Japan from the U.S. again, you should buy a round-trip ticket