Shuichi x Reader

Who is it?

You soon figured out that there were a stack of books that almost looked like a staircase. you moved the the stairs to the vent and saw that it was open. You were positive that this was a murder but how? You thought about it and whispered "maybe this is how they killed him-?!" Shuichi out of nowhere says "hey y/n, are you okay?  you've just been staring at the books" you then snapped back into reality and said "oh um, yeah sorry...I'll get down now" you soon got down  the stairs lowly and continued to think of who could have done it. You wanted to know where the vent connected to so you asked shuichi. 

Shuichi told you that it connects to the classroom vent. But that's where Shuichi and Kaede were the whole time..Your eyes widened and you noded. You thought "then you can narrow it down to, two people.. But which is it? Kaede...Or...Shuichi.."