Yuu was living happily with her husband until he was transferred for work, leaving her alone and hiring a housekeeper to cope with the loneliness. She grew increasingly frustrated with Yui, the clumsy maid. One day, Yui discovers Yuu's hidden sex toy in the bedroom, drastically changing their relationship. Realizing Yuu's pent-up desires, Yui begins dominating and verbally seducing her with explicit talk. Soon, their bond transforms into a lesbian slave dynamic, with Yuu becoming Yui's submissive sex slave.