I was assigned to go on a business trip with Yuko Gunji, my strict and popular superior. My coworkers always said, "She's scary when angry," but to me, she was a rational and admirable boss I've always longed for. Our negotiations went smoothly, and we successfully secured a major contract. However, on our way back, the train broke down, forcing us to search for lodging. The only available room at the hot spring inn we found was a single one, leaving us no choice but to spend the night together. Though unexpected, the place turned out to be quite nice—luxurious dinner, a private open-air bath, everything. As we drank, the atmosphere grew intimate, and I was completely captivated by the way Gunji-san's cheeks flushed pink. I don't remember what we talked about, but that night, I held her in my arms. She seemed surprised, then shyly kissed me. After that, we touched each other, pleasuring one another, and made passionate love. Waking up the next morning to her kiss, I knew last night wasn't a dream, and my desire for my senior flared up again. As long as we had time, we kept craving each other, building a new relationship together...