[Akira flashes Tsumugi a bit of a smile, before crouching next to the cart, running his fingers across the bindings]

The first letters of each title spell out a sentence. "Cat piano on four."

[then he moves to the other shelf, doing similarly]

Meanwhile, the first letters of each title here spell out a score.

[leans back on his heels]

I told the living to play the score on the cat piano. And do you know what happened? They found a key to a door on the fifth floor.

[tilting his head now]

. . . I don't know what all of this means. But there are secrets to this school only those on this side can solve, and the living wouldn't be able to get through that door on the fifth floor without us.

Do you see what I'm getting at?