Jana clearly studied hard, but I also will say that people who are musicians tend to have an advantage when it comes to learning to speak a foreign language because they have the most well-trained ears for picking up the natives' pitch accent. I've listened to her speak English on Takashi's channel before, and it's very much the same thing. Jana has a super-slight German accent when she speaks English, basically to the point that no one can tell that she isn't from America if you weren't speaking to her for several minutes. She seems to have a great ability, no matter what language she chooses to learn, to sound almost-native in short-to-medium conversations.
Olá Haru,prazer em conhecê-la,eu também estou no aprendizado de japonês,estudo um pouco em casa,nunca tive aula de japonês na escola,mas desejo aprender,acredito que Já aprendi o hiragana,eu sou brasileiro.🇧🇷😊