Viva Republica pursues growing appetite for investing among younger consumers South Korea's Viva Republica will enter Japan through the purchase of Tokai Tokyo's Cheer Securities. (Photo by Rie Ishii) TOKYO/SEOUL -- Viva Republica, a South Korean fintech company, is poised to acquire a smartphone-based brokerage subsidiary of Japan's Tokai Tokyo Financial Holdings, looking to capitalize on growing interest in investing among young Japanese consumers and expand its reach in mobile-first retail investing.