Kujaku is a Buddhist monk who specialize in exorcism, devil hunting. He is a member of Ura-Kouya, a secret organization in Japan that specialize in demon hunting. In the first 3 volumes, Ogino wrote independent short stories about Kujaku's demon hunting. But in volume 4, it evolves into an epic saga against a secret evil organization lead by The Teachers of Eight Leaves. The goal of The Teachers of Eight Leaves is to revive Peacock King and Snake King, and allow them to fight each other to give birth to the ultimate Dark Buddha.

The species known as "Human" have long since been assured of their self destruction and complete erasure at both their own hands and by the Hayflick limit. But at last, they have found a symbol of hope… In the blood of the Chyld, Hinagata Heiji. He will be the one to rescue the future of the human race from extinction! –From the cover of Volume 3: Subspecies Chylds are childlike people (even when they have become adults) who each possess an exceptional supernatural gift–a power. Some are "firestarters" for example. The main character, Hinagata Heiji, looks like a loser, but looks can be deceiving. He possesses the uncanny ability to bring to life any inanimate object covered with his blood. He wanders around, enlisting himself in a school from time to time (after all, he looks like a ten year-old). But every "Chyld" has its own territory, and conflicts between them–especially over females–are numerous.