Yeah watching anime in japanese will get you used to japanese enough that you can understand it....IN ANIME.
Being able to understand and repeat "Behold my true form and despair!" has little practical use.
Yeah, you wouldn't want to go around saying shit like NANI!!!!! Really loud lmao
I don't say you should learn from anime... But it's good media to get you started with getting used to the language itself.
I don't "hear" individual words in Russian... It all sounds like meshed together sounds. Though if I watch a ton of Russian media, listened to radio, watched movies etc... I may be able to start picking out words that are familiar as I go along. Only as PART of the learning process to becoming familiar