I'm D, 21 y.o. foreign student living in Tokyo. Graduated from music school back in my country, played in various bands there too, also have few years of tutoring experience. Fluent in Russian, English and Japanese.
I offer piano lessons for kids, novice adults and basically everyone who wants to learn how to play and also how to improvise. Plus there's a mix with conversational English lessons for those who are interested in that.
Now, I'm not saying you'll learn how to do everything possible here instantly - no, it'll take time, efforts (both yours and mine) and burning heart to get there. But you - we - will do it eventually.
I suggest you to take at least 4 hours per week (though it's totally up to you). This way we can be sure you'll progress, work on your skill and keep learning new stuff and polishing what you already know.