Ai Mukai, working as an insurance sales representative, suddenly encounters a strange device known as an aphrodisiac spray. Under the spray's influence, she loses all sense of self and transforms into a being that obeys every command without resistance. She endures every form of humiliation and degradation without refusal, surrendering her body completely. Sensation after sensation overwhelms her, as if she were a toy manipulated by another's hand, experiencing unparalleled pleasure. Her mind gradually blurs, until eventually she loses herself entirely, evolving into a being utterly dominated and controlled.