Fooling! Start Teaching and Training a Useless Vampire Girl

(Core story: [Monster Girl] + [Fool] + [Dihua] + [Second Dimension] + [Multiple Female Protagonists]) "Girl, do you long for power?" Traveling through a different world, Roy, who knew that strength was paramount, decisively used the system to activate the big deception mode. Facing the bullied vampire girl, he had a profound look on his face: "There is a great priest sleeping in your body. If you sign this master-disciple agreement, I will help you wake her up!" Seeing the loli cat girl living on the street, he followed the temptation and said: "Want to have a home? Become so strong that no one dares to demolish your home! Come on, say to me: Power can work miracles!" After blocking the Slime Girl who had no way to take revenge, he reasoned: "A gentleman's revenge is never too late. Learn my fireball technique first, and I guarantee that everyone will look like a torch to you!" Roy thought he just found a few free thugs to make it easier for him to fish. But why do they look at me more and more wrong? Are you still thinking about what kind of reincarnation of a hero you are? When the Demon King was resurrected and prepared to cleanse the world, his "thugs" had already rushed forward before Roy could speak. "I will purify all blasphemy!" "The master said that as long as you are strong enough, you can even blow up gods!" "Anyone who touches my teacher, burn, burn, burn!" Roy: "... Actually, I really just wanted to trick you into signing a labor contract!"