Living in Prime Minister Junichiro Koizumi's "furusato" (hometown), it seems likely that Hisataka (Issa) Koizumi is related.
"Not now," Isa replies, ushering me into his family home in Yokosuka, Kanagawa Prefecture. "But if you looked back three or four generations, there may well be a link."
Isa and I have met often, mostly during the summer, propping up bars on or off the beaches of Shonan. I had thought him to be an antiques and fine art dealer. Entering Art Salon Izumi, he explains that buying and selling artifacts is a family concern; he has his own life elsewhere.
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