Tengujin is a story about two twin brothers who live in a slightly futuristic Japan. Eastern and Western Japan are splitting apart and have formed two warring nations. In this "idiot adult's world", many social issues press on society and drove it to war. Gods of the world, mainly tengu, influence the start and end of the events that lead to war such as Japan splitting into two, so the younger twin, Mozuku, desires to end the idiotic war that the adults started and with his older brother, Shinonome, meets with the God of the West (Sai).

Zanouka, the second story in Tengujin, is about the former incarnations of Mozuku and Shinonome. Mozuku is a young bard who is the inheriting son of a feudal lord of a dead mountain with only poor people remaining on it. He keeps a rigid, realistic perspective on life and refuses to believe in things like tengu. While cleaning the tengu's small shrine, his beautiful voice attracts the attention of the tengu of the mountain, Tondonbou (Shinonome's former incarnation), who hides half of his face behind a mask. After meeting the tengu, Mozuku sets to seeking him out again, wanting to see what was hidden behind that mask.