What are you going to do with onii-chan!?
Do you know what you're doing to yourself!?In this world, isn't onii-chan my... your last family member!?Emiya Kiritsugu... is my father.He adopted me when I didn't have any relatives left five years ago.Sorry...But...Since me and Illya are Kiritsugu's children,If Illya calls me onii-chan,I don't know who Illya is or anyone named Irisviel.Then we're siblings.