I don't know Japanese except a few words and don't know what language the subtitle is but I've rewatched this anime from season 1 to 6 so many times, multiple times a year that I don't need to know the exact words of their conversations to know what they were talking that time or what the episode is about.
Lmao sammme. I can't even tell if I've made good progress in learning the language, or that I've just watched this series too many times. And read the manga too. The manga uses pretty much the same dialogue.