Billy Bat is a manga about a comic artist who, one night, heard that someone had seen a drawing of his main character while in Japan. The artist decides that he can't let himself steal it and so visits Japan while trying to figure out where he had seen it. He then gets caught up in a huge murder case and there are lots of conspiracies and yeah. It's by the same person who wrote Monster. (Can you tell? I can.)
Anyway, it's really good.
I rate it 8 out of 10 for epic justice.
It's only thirteen chapters long so far but it's updating.