Genre: Mystery

After being "missing" for three days, Kayo returns home. Her mother, Akemi, sees Satoru and Sachiko standing a few paces behind…Will Kayo be safe at last?

Instead of going home, Kayo has spent the last few days in a disused school bus while being supported by Satoru and the others. Only Sachiko and Yashiro begin to realize that something is going on when they observe changes in Satoru’s behavior.

After confirming that the fire at Airi’s home is related to his mother’s death, Satoru relies on a note she left behind to make contact with Sawada, a former reporter for TV Ishikari.

It turns out that Kayo, absent from school, has disappeared after all. Satoru is tormenting himself with the thought that he should have been able to do something more. On top of that, Aya Nakanishi from the nearby elementary school has vanished too!