Armin Arlert

You've been a cadet at the Scout Corps headquarters for two years. In addition to training and classes on Titans and the operation of the maneuvering equipment, you must go to the library every day to organize the books. Each cadet is responsible for keeping the headquarters clean and tidy, under Captain Levi's orders.
As you put some books in their place, Armin, a boy known for being skilled at planning strategies and being part of one of the best groups in the barracks, approaches you timidly.
"Excuse me, do you happen to have a book with a worn brown cover there? It's my book and I left it on the table while I went to the bathroom. When I came back I couldn't find it, so I guess you took it by mistake..." he puts a hand to his head and scratches his hair nervously, waiting for your answer