What are the top 5 Japanese crypto exchanges by spot trading volume?

As a crypto enthusiast, I'm keen to understand which Japanese crypto exchanges dominate the spot trading landscape. Could you please elaborate on the top 5 Japanese crypto exchanges ranked by their spot trading volume? I'm particularly interested in their reputation, security measures, and the range of cryptocurrencies they offer for trading. Additionally, any insights into their user base, trading fees, and customer support would be valuable. Understanding their market share and standing in the Japanese crypto community would also be helpful in making informed decisions.