Ah for me learning through anime is difficult because I always forget I'm trying to learn a language and get caught up in the story haha. I think it could be helpful if you have other learning methods going at the same time. But to learn Japanese mainly from anime no wayy. At best you'd pick up a few phrases. One thing that I do is I get those 3 minute anime series, and I watch it twice. Once with subs, and a second time without them. Been pretty helpful for me.