I Can't Be the Chief of Chaldea

Waking up on the operating table. Durin had originally thought that saving humanity was all he needed. But then—Fuyuki's 'AI', BB-chan, who's trying to conquer the world, invades Chaldea, wanders the Far East, sharpening her knife to find the murderous woman I killed, and the Root Girl, who comes looking for Saber, is completely unreasonable—and then there's a silver-haired Leo woman who wants me to be her right-hand man and acting director of Chaldea. Hmm... This is probably a world where even messing around with Gudafu & Gudako won't be enough to survive!