A businessman mysteriously wakes up in an open-air prison cell with only an old grist mill. Forced to work as a beast of burden, he must find a way to escape before the birth of his child.
After his last tour, Aurélien decides to settle in Japan with his wife Nanako, pregnant with their first child. In their new house in the Japanese countryside, Aurélien discovers an old armor that awakens strange creatures, the Yoka?s.