In the 12th century, Buddhism was still a relatively new religion in Japan. At that time, one school (Shingon) offered extensive training in complex and very demanding practices which might eventually bring about spiritual purification and realization. Various Zen schools offered students a lengthy path, literally composed of a blank wall and unceasing meditation. Yet another school (Tendai) emphasized complex metaphysics and the study of philosophical systems. Basically, all of them were designed to cater to the few who were able to give up everything else in their lives and focus on liberation, such as scholars and noblemen. In this historical and biographical drama, this is the situation that the young Shinran (1173-1263) discovered when he began exploring Buddhism as an alternative to the violence and ceaseless civil wars that racked Japan at the time.
A new groom becomes suspicious of his bride on the first night of their marriage. Seeing her go out of the room in the middle of the night, he follows her. The bride goes to a cemetery and drinks blood from a body she has exhumed. The bridegroom is so shocked that he dies of heart failure. His friends watch the bride's every move to find out the cause of his death. And they realize that she is a sleepwalker.