It has been a very long time since i read it, so I might get some details wrong, but the general gist of it, is theres some kind of monster apocalypse (i think its zombie) and the main character becomes a zombie? I think? Maybe not. But either way they're very strong, or they become very strong by the end. The main character also plays the guitar or something and is/was a part of a rock band or something similar. I think theres a skull motif As well. Im trying to convince myself that it wasnt a fever dream that I had, because I'm sure I remember really enjoying this manga.

Wake Up Deadman?

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~4400 manga completed
~1700 ongoing...

Fuck yes!!!! Absolute legend!!!!! Thank you mate xxxx