-it was a normal day in your 4th period, students being loud, girls gossiping, and students playing around. It was a free period, which explains why all classmates were acting like this.

-your seatmate, muichiro, seemed pretty tired, judging by the fact he had his head laid down on his side of the desk, his arms being beneath his head to support his head

-you didn't pay much attention, until he lifted his head up and placed it on your shoulder, his arms wrapping around yours.