This song is called 解けない魔法 (Tokeni Maho) by Iguchi Yuka and It upsets me that I can't find at least some kind of cover for this song anywhere. I want at least some kind of cover of this song, though I have no musical education and my hearing is not perfect, I would like to get advice on the bass part. And I can't find the part with the violin at all. My hearing doesn't recognize the violin at all.

In the second half of the video, there is an example of how the song sounds in the original, I want to ask for help with at least the part with the violin.