No Export for You: StarTropics and its sequel have never been released in Japan as the Japanese mapper chip (the MMC6A which is based on the MMC5 chip) of its prototype is more powerful the the mapper chip found in the US/EU versions that did come out (the MMC6B which is based on the MMC3B but with 1KB of built in ram and can do larger sprites of 32x32 rather them 8x8 or 8x16 like the MMC2 (Mike Tyson's Punch-Out!!) and MMC4 (the Japanese version Mike Tyson's Punch-Out!!, Famicom Wars and both Famicom Fire Emblem games) chips); however the Japanese version of said mapper was so expensive to make that it was cheaper to work with the Super NES, so it never came out in Japan because of it. In addition, only the original was released in Europe.
The Virtual Console gave StarTropics II to European gamers in July of '09. Japan still hasn't seen either game.