What do you mean by mod hatsune whatever whatever whatever? And is this game made for a newer console?

look up gamebanana download it go to Sd/luma/titles next go to hshop on the web browser look up the game and copy that title id navigate back to luma/titles and make a new folder with the name of your title id then extract the mod and drag the mod in the folder you made

square space is a rough estimate i believe i would recommend upgrading your sd card

For clarification: open gamebanana click search under search click games then search:hatsune miku project mirai dx

then download whatever mod you want