some bg suggestions because i dont think that a bg that dark fits the song very well
https://twitter.com/daidai_kasame/status/1430823619081342976
https://yande.re/post/show/846892 altough i couldnt find original source to that
https://cdn.donmai.us/original/9d/5e/9d5eeaa8809373a1c5c4f1057c6375ca.jpg same as above
https://drive.google.com/file/d/1GhoJ5oFUHMxul4vKk0fl7CZUqh21tTx9/view?usp=sharing here the vid in small enough if u want
langauge should be japanese imo because she sings in japanese in some parts of the song, english should be the case where the entire song is in english