In the reign of the Emperor Suzaku (930- 946 A.D.), various mishaps happen after a strange white rainbow in appearance in the sky over Kyoto. The Emperor orders a famous astronomer, Yasunori, to consult a certain Chinese book of secrets to calm the fear of the people. Yasunori has two disciples, Yasuna and Doman. But he desires that Yasuna succeeds him because Doman i...