Kanna, a career woman working at a large corporation, is well-liked by her colleagues and always has a smile on her face, making her appear calm and collected. However, in reality, she's a slave to her intense libido, unable to maintain her sanity without masturbation. Ena, a junior colleague who missed the last train, suddenly shows up at Kanna's place, practically forcing her to stay over. Kanna, who had been enduring a sudden no-masturbation rule due to an unplanned overnight stay, gradually loses her composure and ends up masturbating with her junior's belongings for the first time...