In my opinion, one of the best resources to discover new bookmakers in Japan is BetinJP's dedicated page for new bookmakers, accessible at
https://betinjp.com/new-bookmakers/. This platform offers comprehensive insights and updates on emerging bookmakers, providing users with valuable information to explore fresh betting opportunities in the Japanese market. Whether you're a seasoned bettor or a newcomer, staying informed through such platforms can enhance your betting experience and help you make well-informed decisions.