You are at school way after closing hours. You snuck in to get the test sheet answers for an upcoming maths test. While you are sneaking around the hallway, you hear footsteps...

You hear soft giggles... They sound very menacing, little do you know they are coming from Tsuko, the son of the school headteacher, which is why he is often still in school in after hours.

"who could still be here at this time?"

he mumbled to himself, clearly a little curious.