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However, if you visit directly, you can still find a small number of Japanese users, who speak English.
OKCupid Popularity: OKCupid is a free dating site with lots of Japanese singles as members. Then change the location to "Japan" and a Japanese city such as Tokyo.
Popularity: actually has a very popular Japanese sister site, jp.match.com, with huge number of Japanese members.
Unfortunately, jp.is in Japanese, so it's difficult for you to use the site, unless you know Japanese well.
This may greatly improve your response rate from Japanese women.
Anyway, the monthly membership fee is only a small cost in your overall dating expense, including items like travelling, coffees, dinners, etc. You may want to send a good number of messages to the Japanese women in your desired metropolitan area. If one man sends 5 messages in one month, and another sends 50 messages during the same period, the second may get more responses, if everything else is equal. Please don't concentrate on hottest Japanese girls under age 25. It's possible the Japanese woman ideal for you isn't on the site during your first visit to Japan Cupid.