In this episode, we learn a little more about Shiba, Chika's old friend, who turns out to be more than just a filler character. He's quite intelligent and will be a great help in getting to... what? I certainly didn't understand the point of solving the clues if they haven't actually found the culprit. That was just a random internet search. We also finally get an explanation as to why Chika and Shito have to exchange hands and why they work together despite not getting along so well. Although this episode seems to have many logical errors and a few convenient plot points, the characters' charisma somehow makes the inconsistencies less noticeable... like, for example, telling a complete stranger to work for a zombie agency. You'd think that kind of thing should be kept secret.