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As a exceptional rule at the custom house, you can bring doctor-instructed only one month worth of medication with you because doctor's instruction is assumed to expire in a month.

Does your doctor instruct you to use the medication for next three months ? Showing the written instruction by your doctor, Custom house might allow you to bring the three months worth of medication.

With one month medication, You should find new doctor in Japan within a month after arriving.

Or, your relatives could send one month worth of medication to you at once with one month interval.

Anyway, you should call +81-6-6942-4096 or send fax to +81-6-6942-2472 for authorized answers.