Gen is a lonely orphan boy. His sole sense of companionship comes from an imaginary friend, the god Prince Fudo-Myo. Prince Fudo-Myo comes to the boy's rescue in times of difficulty.

An uncle decides to put his delinquent orphaned niece into a temple in Kyoto known for its austere novitiate. Initially resistant to all forms of discipline, she ends up falling in love with the nun who is in charge of her.