Rooster Fighter manga volume 8 features story and art by Shu Sakuratani.

Although Chicken Little was able to save Morio, she herself has been possessed by a demonic entity determined to destroy Keiji, Keisuke, and Elizabeth. Tormented by guilt, Chicken Little flees the group, while Keiji and his companions must continue on. Something has changed within Keiji now that his Righteous Egg has awakened, and he must learn to control it. To do that he will need to head for the mysterious forest that surrounds Mt. Fuji and find the Righteous Master…