As a train trundles north from the Japanese capital, through the nondescript concrete of greater Tokyo, you might catch a whiff of churrasco or a few bars of samba emanating from Ōizumi. Following generations of on-again, off-again immigration, the town has the greatest concentration of people of Brazilian descent in Japan, approximately 10 percent as of 2015, compared to less than 1 percent in major cities like Tokyo and Nagoya.