Always could play on his ego, or use the form of maido, lots of things really, I just wouldn't go after the book, or at least something to send him on a chase. Course thats just my very vauge opinion.
@Salt Lord, the military don't have the school rank, they have military rank which is the same as real military ranks so it's your choice what your character is ranked at. As for being at the school, I'm going to say that they are stationed at the school to protect the barriers and students just in case.
@ScarletNova, I'll ignore the real ranks simply because I'm lazy, and as for the 'being stationed at the school' thing, I was thinking the same thing. I'll have my post up as soon as possible. :D
Edit: Welp. Something went wrong with the border. A little help, @ScarletNova?
Just a suggestion, but if you want to really get the ninja, apologize and take the comic he took from Yoko. When the maid comes back and tells him to return it... well, he'll put two and two together xD Only a suggestion though.
Ah, I thought you were making the illusion of both of them. I'll edit. No problem. You can still use that suggestion if you want, since they're roomies :P