How many trips a japanese citizen can visit US in a year in VWP?

Question:

I Know there is a 90 days rule on visa waiver program. just wondering how many visits i can make in a year. I intend to stay 90 days in USA and next 90 days in japan and so on... is that possible by law ?
i don't intend to migrate or work etc..

Answer:

You are not saying which citizenship you have. So there is no answer.

You say something like you are a Japanese citizen. But if so, you don't need to ask "next 90 days in japan and so on." or something like that. Japanese citizens can stay in Japan as long as they want.