Here are the links of the owner if the audio and the background music
The one thing you can't replace
https://youtu.be/0dbJHppgrHc
Demon slayer [Opening] violin ver.
https://youtu.be/ihhm_pgn2TI
Piece of my world piano ver.
https://youtu.be/KCA_l9FemHM
And also the anime girl in the album I found it on goolge
so yeah
anyways guys bye~!