Probably the worst person to owe any sort of debt to - Wolverine makes his second appearance.
When I was searching to buy Wolverine: Blood Debt before i started writing the top 100 best graphic novels list, I used google just like everyone else. The first results were pretty much what you'd expect; links to buy the book. That's cool, because that is what I was looking for.
For some reason, I decided to look further down the search results, and I found myself laughing when I saw a link to a page with the title: How many people has Wolverine killed? Of course I clicked the link to see what was behind it, and it turned out to be a forum. Someone had answered the author's sincere enquiry into Wolverine's body count in the best possible way - he just said "thousands".
Wolverine is one of the best and most beloved of graphic novel characters. Known widely for being part of one of the best superhero teams in the comic universe, Wolverine is such a popular character that he has had plenty of outings of his own. Now, it's difficult to pick one out of all of his graphic novel adventures and call that one the best, so I have so settle for recommending one of the best ones written. It is for this this I recommend Wolverine: Blood Debt, but I also say you should check out the other Wolverine books, because there are loads out there.
Wolverine: Blood Debt is one of the Wolverine stories set in Japan, a country significant for the man with the metal spine because it is where he best learnt how to control his anger. The story is about a clan feud, honour and betrayal, and isn't a work of great originality. It is the character that pulls this through, as well as the quality artwork. I include Wolverine in the top 100 list, but I think you're best checking out as many of his adventures as you can.
Coming next on the top 100 graphic novels list is a story of war.