Type-Moon: Villain Simulator

After a car accident, Nian arrives in the Nasuverse and becomes a child of the Einzbern Family. The moment he hears the name “Alberget von Einzbern,” he braces himself for a miserable future.

Yet after living there for over twenty years, his mother Alice is still alive, and she and his father, Kiritsugu Emiya, have even given him a younger sister named Illya. That's when he realizes that this world has no mystery.

Just as Alberget lets his guard down and prepares to coast through life, a suddenly appearing Villain Simulator System tells him that, to preserve the world, he must complete its missions. Otherwise, this world will overlap with other parallel dimensions.

To keep tragedy from happening to him, Alberget sets out to become one villain after another.