https://www.martinclubjp.com/martin-junior-series-%e8%b3%bc%e5%85%a5%e3%81%ae%e6%96%b9%e3%81%ab-martin-era-strings%e3%82%92%e3%83%97%e3%83%ac%e3%82%bc%e3%83%b3%e3%83%88%ef%bc%81-junior-series-x-era-strings-present-campaign/Martin Club Japanja2026-08-07T10:53:37+09:00Martin Junior Series 購入の方に Martin ERA Stringsをプレゼント！ Junior Series × ERA Strings PRESENT CAMPAIGN スタート