A boy is attacked by a giant monster and gets injured. The injured boy runs to a nearby village where Akane lives and warns them about the monster. The residents are frightened. Akane, Sakakida Soei and Kikuchi Enshu look for a way to protect their village. Meanwhile, Akane's older brother Soya Danjo schemes to manipulate the monster.
~~ Adapted from the novel "Kou Jin" by Miyabe Miyuki.