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To buy my girlfriend a birthday present, I started my first part-time job in a beef bowl chain restaurant. I didn't know what to do and was constantly getting yelled at by customers, but I was able to continue working thanks to Yumi, a housewife who was always kind enough to teach me. Then, one summer vacation, I found out that she was cheating on me. It seemed that Yumi had also found out that her husband was cheating on her, and we consoled each other by making love to each other after work, covered in sweat. In a hotel..., at Yumi's house..., in the office..., and inside the store after closing time...