Looking for a song ?

I am looking for a song that come up as an add on YouTube. I don’t remember to lyrics or the artist - song name. What I remember is that the music video was in an anime style and it had an African -American girl singing in a coffee shop as a barista and she sang in Japanese during the song occasionally. She was singing to a guy in the video who had a girlfriend, who was angry at the singer for flirting with her boyfriend (I think?). She also looked in a mirror and saw her demon self(I think?). Does anyone know the artist -song name?

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