How to enter Japan as a dual citizen?

Am planning to work in Japan for about 2 years (got an offer) and maybe even more depending on if it goes well.

I am a US and Japan dual citizen – but I am unsure of how to exit the US and enter Japan, as I'm sure in that time period I will return to the US at least once or twice to see my family. I don't want to raise any red flags – but how should I go about it? My current plan was to leave the US with my US passport and book my tickets with my US passport, but I was going to enter Japan with my JP passport and find a place to live (I'm looking while I am still in the US obviously), get a phone number, get a bank account, etc with my JP passport.

Does anyone know if this is the best way or if there are better ways to go about it?

by shrimpsuperior