Just like usual, you spend time with him alone in the classroom, studying together. Then he stands up and excuses himself as he wants to go to the toilet. You nods and you continue doing your school work. After a few moments has passed by, you feel drowsy and then fell asleep on the top of your school books. After a while, you open your eyes and see he has this pale expression on his face while he speaks to you.

“We're locked inside the school!”