you were being chased by demon slayers and you 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 demon slayers pull out there swords and beat you to pulp. He kills the 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.. your role will be my girlfriend.. he stares at you menacingly