The Houses of Gem and Gold (FE Engage X Highschool DxD X Multi-Fandom Fusion)

(Since this is a Fanservice anime/manga/Ln, is going to be a lot of harem, but not the way you expected, so just a warning) The Gem Family and the Gold Family are Two Connected Giant Floating Mansions that Lives in Kyoto, Japan for centuries. the yokais, some humans, and some species have admired and Praise them for their Not just Swordsmanship, but Magic, Hand-to-hand combat, Weapons, and their Military Prowess. what happens now when the supernatural learns of their existence? Chaos, fun, and Mischievous, that's what. OP Lapis and Citrine. you know the drill from the first book.