Recently, Kosher certification is becoming popular in Japan. Chabad Japan and Kosher Japan are mentioned in several news media. Please check the articles.
Newsweek Kosher Sake Pours Into Japan
DIAMOND online 京都の緑茶にみる「ユダヤ教の食品認証」、日本でもますます増えそうな理由
This article is about Kosher Japan giving Kosher certification to Japanese Tea companies.
JAPAN TIMES “Tokyo rabbi gives unconditionally”
JAPAN TIMES “Get the latkes out for Hanukkah in Japan”