At my level, I couldn't learn Japanese that way. I just wouldn't be able to read the text as I barely know any kanji yet. It sounds like a great idea though. It must really immerse you in the language, which of course is always the easiest way to learn. I watch anime in an attempt to immerse myself in the language, and I have picked up some phrases and vocabulary, but it's not easy to learn that way. If I didn't already have a basic knowledge of it from taking Japanese classes, I would be lost.