Reborn in Another World, and My Childhood Friend Turned into a Catgirl?

【No System】+【Childhood Friends】+【Magical Prodigy】 I just transmigrated, and my childhood friend has turned into a catgirl sprawled across my lap and acting cute? And I've awakened a talent for magic? While everyone else is still struggling through their magic practice, Lu Bai is already studying combinations of forbidden spells. While everyone else is fighting tooth and nail over a single piece of high-quality gear, Lu Bai is mass-producing divine artifacts with the scientific knowledge from his previous life! Years later, when the demons of the Abyss descend and see the army of catgirls, elves, vampires, and dragon girls behind Lu Bai, each with a "Super Shinra Tensei" at the ready, they fall into deep contemplation. Duke Reinhardt: "I intended to bring him under my control, but in the end, I realized the entire kingdom would be groveling at his feet!"