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Yes, you can normally send any type of mail, including international, from any post office in Japan (and yours is no exception, otherwise it would be mentioned on the page). They can also come to your place to collect the parcel at no charge if you prefer (I suspect that the reason you want to send it from this particular office is that the parcel is to heavy to carry to others), just inquire at a bigger post office where they have English-speaking staff.