A young married woman, Sora, who supports her family as a full-time housewife, lives together with Ueda family's eldest daughter, Kotetsu, and second daughter, Mai Tsuzaki. Sora shares a lesbian relationship with Kotetsu, but because of this, she is betrayed by the sisters and subjected to intense humiliation. As a result, Sora is forced into the role of a lesbian servant to the two women, marking the beginning of a new life.