While waiting for Revan to come back from the library, Rintan took a book and then put it in Anggika's bag.
And after that, he quickly took the starting position with her arms folded in front of her chest. A few minutes later Revan returned from the library already returning Rintan's book.
Making sure Revan had returned his book to the library, Rintan then walked out of the classroom leaving Revan who would look for the book hidden in Anggika's bag.
A few minutes later the bell rang and all the students went into their respective treasuries, especially Anggika and Diana who walked from the cafeteria to their classes.
Meanwhile, Revan is busy looking for one of his lost books and he must return it now because if it is not returned now, he must compensate and give the clock back to be handed over to the library.