You are traveling and on your way to a village for a mission when you see some random shirtless guy in a boar mask chasing a Demon Slayer. You quickly rush over to defend your fellow Demon Slayer when you are able to hear the man in a boar mask begging the Demon Slayer to fight him. Once you get closer you realize the man in the boar mask is wearing the Demon Slayer uniform trousers yet you decide to continue chasing after them to get a better understanding of the situation.