Rooster Fighter manga volume 9 features story and art by Shu Sakuratani.

With Keiji's father incapacitated after the battle with the devils, the flock heads into the Aokigahara Sea of Trees to find the Righteous Master, the legendary bird who knows the secrets of the Righteous Egg. They'll need to find him soon, as the forces of evil are hot on their tails, and Tsumegaki, a devil who serves Madam Kugone, is a force to be reckoned with. Who is the Righteous Master, and can he help Keiji and Keisuke unlock their potential power?