A playboy weeb from our world, that doesn't know anything about Touhou, gets Frieza-sama powers and the appearance of Killua Zoldyck from Hunter X Hunter, then gets isekai-ed to Touhou Project world. In case you find incorrect information in the story, don't worry, it's not me who didn't know it, but the characters themselves, it's not like they have a wiki about their world like u

What would happen to the world of DxD if Madara Uchiha transmigrated into Rias Gremory? What would happen if he/she have the Eternal Mangekyou Sharigan, The Ten Tailed Beast and the Complete Six Paths Power? (Transmigration happen in the Rating game climax against Riser's peerage)