Your question isn't worded very clearly.
Do you mean that you want to take part in a homestay program with a host family in Japan?
This is usually something students do as part of a study abroad program through their university.
A quick Google search for "Japanese homestay" or "Japanese host family" turned up options that say they can cater to tourists, but I have no experience with such programs, so I can't really say how reputable they are.
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