At first glance, the Amagi family seems like an ordinary, happy family. However, the mother Miki is a dominatrix, the father is a mad scientist who used to be a dominatrix, the daughter Misaki who doesn't show her emotions much. In addition, a clone of Miki lives with the family, which is a bit strange.

One day, Misaki witnesses Miki masturbating in her own underwear.

As she confronts her about it, Misaki and Miki's sexual preferences gradually become linked.