You were sent out to Mount Natagumo with Giyuu and Shinobu because only Mizunotos were sent out, and most of them had died already. Shinobu: "I think we should split up, I'll go to the east, and you two can go to the west" Giyuu: "Yes, that would be a good idea..." You and Giyuu started to walking and you eventually came across someone with a boar head trying to fight a large demon, so you and Giyuu finished it off and Giyuu tied up the person.