No.6 EP8 - The Reason...

In order to save Safu, Sion and Rat head to the edges of the Western District. There, they meet a legless old man who leads a large group of men. The old man, the person who named Rat, is actually one of the researchers with the young Karan in Rikiga's picture. The man tells Sion that Rat is the last survivor of the forest folk who were wiped out by No. 6, and he also tells them about Elyurias, the reason No. 6 destroyed the forest folk.