Career woman Yui had been enjoying smooth sailing after securing a major client contract, but a work-related mishap caused a significant loss, leaving her vulnerable to exploitation. Forced to submit her body to the client, she gradually finds herself repeatedly summoned, tightly bound, and mercilessly pushed to her limits. Before long, Yui begins desperately begging for cock, coming to view sex as her sole purpose, transforming into an insatiable, depraved slut.