Help me find a song please! (Its in Japanese btw)

From  all I remember the song was in Japanese and I only remember one part of it. I do remember the cover of the song though I might be a bit wrong because it's been some time since I've seen it. Basically from what I remember it was a white haired anime boy and he was holding something it think it might have been a heart or blood but I just remember it being red, I also remember that the background had something in it like I think it was bones or a ribcage but I can't remember I may be totally wrong 😭. I know this isn't a lot to go by but hopefully the internet can do it's thing!