Amano and Gasai disappear.
Detective Nishijima inherits Fourth's case files. He learns about the diary holders.
He and Akise work out a plan to have their high school friends search for them, figuring they'll run if the police do the search.
They all get captured.
Gasai has gone a whole new level of cuckoo bananas. She has taken over an old hotel and has Amano prisoner, as well as all the others.
But Kousaka (Amano's friend) suddenly gets upgraded to an Apprentice Diary Keeper. He busts everyone out.
How? Eighth has the ability to share.