This is an official banking app (for individuals) provided by Yokohama Shinkin Bank.
よこしんバンキングアプリ - Official Banking App
よこしんバンキングアプリ is an official banking app provided by Yokohama Shinkin Bank, enabling individual customers to check balances, manage deposits and withdrawals, and transfer funds conveniently on their smartphones, 24/7.
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Source: Google Play Store
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