I have never heard of that manga but now I really want to read it! I have a long list of manga I want to read however :/ . The drums were supposed to just sound like a train and nothing else. I probably should have put more thought in them than just that same loop the whole time but I had trouble coming up with anything and I was at the point where I just kinda had to throw something at the wall and let it be. Thank you for listening :)