I'm studying japanese, and watching anime /reading manga is kind of helpfull.
English isn't my first language, and since I can remember I learned most of it by watching tv series (as kid - cartoon network
). Right now, most of the english movies I watch is in original language with no subtitles. I often watch the same movie multiply times, this makes me remember whole phrazes or sentences. I know that my english isn't perfect and much needs polishing, but I can communicate with almost no problem
I also read many books in english, I understand much more than I can say ^^;
I find watching anime very similar, also reading manga polishes my knowledge of japanese alphabet. But in order to make full of anime, you already need to know some japanese. Starting from scratch won't do.