As the students have been revealing their own powers one by one, they must band together to solve this latest puzzle: an incinerator that will burn either the class president or one of the passwords if they save the other. Can the save both before the time is up?
Later, one of the students plans to take a password and escape without anyone else. When Haiba tries to stop him, the student drags him into a "flat" world where his dream diary won't help him. Can he escape before he is trapped there forever?