[ Oh. Nao looks surprised to hear that either Arisu twin meant a lot to people, because most people don't bother dealing with a boy who doesn't talk or a girl who has no patience for people. It's a good surprise, but also a confused surprise. ]

Right! Did you have any more suspects in mind besides Shirogane, Akehoshi, and Amami? If we can figure out who did it, there's always confronting suspects and pressing them until they crack.

[ It's called interrogation. A valid tactic. ]