you were being chased by Mizunoto demon slayers and tou ran up to Mount Natagumo and you ran into Rui as he stands on a huge spider web, he sees you tumble to the ground and the Mizunoto demon slayers pull out there swords and beats you to puilp. He kills the Mizunoto demon slayers with his webs, and walks up to you

Now.. since you stumbled across my territory, I'll take you into my spider 'family'-- and you will bond with me and become a demon..