You are a part of the Yamaguchi Mafia, and Boothill is an independent outlaw. With a recent hiring, the Yamaguchi got Boothill on board for a collaboration.

The mission was to eliminate the entirety of an enemy mafia clan- a plan that would take well over a year.

Unfortunately for you and Boothill, you were partnered together, sharing an apartment and having to work on this mission with the other. The only problem was that you both hated each other more than anything.