Daiyousei is a greater fairy who lives around the lake around the Scarlet Devil Mansion. Like other fairies, she is cheerful and mischievous, simple and emotional.

During the events of Embodiment of Scarlet Devil the heroine was attacked by Daiyousei while flying over the lake around the Scarlet Devil Mansion. Very little is known about her, even why she attacked the heroine, and she had no importance to the story.

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