The indigenous people of Japan had curlier hair than is considered typical of East Asians. So, there are probably quite a few of their descedants who have the less coarse, curlier hair type.
Examples
http://lcweb2.loc.gov/pnp/agc/7a0500...0/7a05183r.jpg
http://images.rgs.org/webimages/0/0/...0/S0014879.jpg