On a night of torrential rain, the trains stopped running, forcing me to walk home from work. My coworker, office lady Mika Minamisawa, who had stayed late with me, said, "My place is close—why don't you stay over?" We barely made it to her apartment in the downpour, but when we arrived, she was soaked, wearing a sheer, translucent dress shirt. I couldn't help but stare—yet her expression seemed strangely pleased. I resolved to hold back, but the moment she changed into loungewear, my composure shattered completely. Her deep cleavage spilled out, the faint blush of her bare skin released an intoxicating scent, and then—her areolas... a soft peach color, plump and perfectly shaped, incredibly alluring. Before I knew it, I was reaching for her breasts like a man starved. She responded by revealing a side of herself no one ever sees, surrendering both her heart and body to me. Her vulnerable loungewear, her lovely bare face, our bodies pressed close—surrounded by the sound of rain, our passion knew no end. This is the secret story of an intense, unforgettable night with Mika, a married man's forbidden encounter with his subordinate—a night of heavy rain that no one else will ever know.