Have you heard of .hack//G.U. First Login? It was an audio drama that came out prior to the release of .hack//G.U. Vol 1 Rebirth in Japan on a reservation disc called .hack .hackers Premium in 2006. It's about Ovan hiring some PK'ers to do some wetwork.

https://archive.org/details/dothack-dothackers-premium-dvd