I seriously didn't realize until just now that that paper was one of Shu's tests. I thought it had soething to do with motorcycles or something. This makes a lot more sense
Ahh, youth~Aiba-san's Great DeductionIt's Amiguchi's test...
Surprisingly smart, that guy...AmiguchiYuki-chanStop...Hm...?
There's some balled-up paper lying around...The culprit is...
A person who really loves Takamiya-san.