After losing her beloved husband, widow Ikuyo Hoshizora is left with a burden of debt that she can no longer bear. With no one to turn to, the only person who offers her a helping hand is an obese man with a lewd gaze. Accepting the condition that she "pay back the debt with my life," Ikuyo changes from her apron into a frilly maid's uniform.
Initially, her humiliation-filled service gradually transforms into pleasure as the man's relentless caresses and the hot, milky fluid he relentlessly pours into her body. She cleans her master's thick cock (fellatio), and in between cooking, her skirt is lifted, and she moans while dripping with breast milk and nectar. The dormant female instinct within her easily overcomes her maternal rationality.
As the seasons pass, Ikuyo's appearance undergoes further transformation. In a bedroom that isn't even a church, she is dressed in a pure white wedding dress and a red collar is placed around her neck, signifying her ownership. The belly of her dress bulges out as it carries her uncle's seed. Memories of the daughter and home she once loved are driven far away by the repeated orgasms and insemination. "Giving birth to my master's child" becomes her greatest joy, and she opens her legs with a happy smile. The fallen human mother has accepted her new life and a happy life as a slave.