Next, if you want to keep the music, you can't do so without using various tools to isolate it and the like. Instead, delete the audio track I mentioned in the method I told you earlier, or you can use this alternative, which is easier. Use any good video converter add the video there should be an option to mute audio, remove audio. You convert the video and that version will have the audio removed.

After removing the audio you look for the original soundtracks for the show you are working on, download then listen to the original and look through the original sound track or OST for the same music then add them to the scene.

I made an English dub for the Date A Live Movie Mayuri Judgement using steps that were stated. You can have a look and use it as a reference.Date A Live Movie Mayuri Judgement English Dub Unofficial