It was the same day as always,the lessons were boring for most of the students,others were sleeping and the others were taking notes

One day u had to do partner work and u had Yuma,he is actually very quiet but many said he is not that innocent,u worked together quietly when Yuma asked for a ruler,u gave him one but the wrong one...

"Oh~ What is the red line for?~"

He held the ruler on which a red line was drawn at a certain centimeter and grinned mischievously,he noticed the line...