It depends on what you mean by it. You can say “Daiji ni suruyo” (lit. I will treasure you) or “kimino mendo wa bokuga miruyo” (lit. I will be the one who takes care of your life - a strong commitment) if you mean in a romantic way. If you are saying to someone (could be anyone) who is coming to your hometown and you want to say that he/she won’t have to worry about a thing; you will take care of the person, you could say “bokuni makasete” (Leave it to me).
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