The letter Yuki got from Akihabara Academy threw every one for a loop, Yuki especially. Even after her mother confirmed the letter and school was legit, Yuki was confused as to why a 'nobody' like her would get invited to a school like this. 

Even after a plane trip, getting settled into her dorm room and walked through the campus toward the auditorium to the introduction/welcome speech from the teaching staff she still wondered why she'd been invited.