Arisa and Ayaka, mothers who send their children to a nursery school in the city. One day, after Arisa had an argument with her husband, she sought help from Ayaka, who then proposed a 'mistress contract.' Surprised by the unexpected offer, Arisa hesitantly agreed. From that day on, her repressed masochistic tendencies began to surface, and she started begging for BDSM training. Forgetting her role as a mother, she indulged in female pleasure. The two sank into a dark, somewhat ephemeral, yet pleasurable lesbian sex life.
