The shocking development of a young lady cumming repeatedly from her armpits! After enduring a three-week period of abstinence, did she keep her promise to refrain from sex and masturbation? When the prim and proper but secretly horny "Sayaka" murmurs, "I might not be able to resist and end up masturbating," an intense tension fills the air. Having graduated from junior college, she took a job at a workplace with no social opportunities, as recommended by her parents. Seeking escape from the monotony of daily life, she had been lost in fantasies and self-pleasure—until her world changed through perverted training. The impure emotions and physical temptations born from this transformation deepen the story.