He is in Type- Moon , and his sister is Illya

Life is always unpredictable. The otaku Mu Zi wakes up and finds himself turned into a baby, adopted and raised by Irisviel. However, the Type-Moon world is full of dangers, and there are many people who want to take advantage of his sister Illya. What should he do? Fortunately, Mu Zi also traveled through a League of Legends career system. Anyone who dares to take advantage of my sister will be beheaded by my Noxus guillotine!