Hiragi has a dream and tells Kayano Sakura about it. Hiragi tells the students how the evidence they have found so far has led to this moment, which starts the real work. That what was revealed before wasn't all there is to the story. Today's challenge is self-study, for the students to spend their time however they like. And with this he gives back their belongings. However -- one of the students finds out something that they hesitate to tell the others. (Source: MyDramaList)