The novel from writer NisiOisin and artist Hikaru Nakamura is a prequel to the Oogiri work and it came out in 2015.
The participants are twelve very strange warriors: “Rat,” “Ox,” “Tiger,” “Rabbit,” “Dragon,” “Snake,” “Horse,” “Goat,” Monkey,” “Rooster,” “Dog,” and “Pig.”
Twelve brave warriors who bear the names of the signs of the zodiac fight each other for the lives and souls.