鷺ノ宮 世津

She lives alone with her elderly butler in a Western-style house on the outskirts of town.

The Saginomiya family is a former samurai family, which fell into its usual decline following the Civil War, but they managed to eke out a living from their hidden private fortune, and for a time enjoyed a certain amount of prosperity, however, with the death of the previous head of the family, Kazumaro Saginomiya (Setsu's husband), the family is now quietly waiting for the end.

Setsu is nostalgic for her former prosperity and the memory of her late master, It is a complete lie to say that Setsu is quietly living out the rest of her days with her old butler, Kondo... It is Setsu who is directly responsible for the breakup of the family.

The reality that lurks behind the fragile exterior is a poisonous woman with a superb body, heavenly sexual skills, and a devilish brain.