Ninja World Dog Demon: The Fang of Iron from the Start, with Kakashi as My Companion

One moment, Xin Ya transmigrated into a dog. Before he even had time to feel sad, he got a transmigration golden finger: the Demon King System. (⊙o⊙) What?? The main quest is to found a demon kingdom and become the Dog General, a regional overlord? And the rewards are items from the Inuyasha world, like the Shikon Jewel, Tenseiga, and the Black Pearl?? Delighted, Xin Ya prepared to become the new “Touga King,” the Dog King. He swore to change the story, have two puppies, Sesshomaru and Inuyasha, and rule the Warring States period, enjoying a happy family life with loving parents and close-knit siblings. But just as he settled on his goals for dog life, a white-haired boy appeared out of nowhere, leaving him with a darkened dog face and utterly bewildered! A Konoha forehead protector? A young Kakashi? The era of the Fourth Hokage? What the heck? He’s been sent to become Hokage as a monster?! Xin Ya quickly adjusted his attitude to deal with this unexpected turn and set himself a new goal. What difference did it make where he did it? In that case, he’d work hard to take human form and build a demon kingdom, then have beautiful women like Tsunade, Hinata, and Mei Terumi bear puppies to inherit the throne. Yes, it would all start by turning Kakashi into a half-demon...