One day, Asato, a college student working part-time, hears a man and a woman fighting in the back alley after his part-time job. When he peeks in... there is Yukino, a classmate he admires who goes to the same university as him! Asato unintentionally saves Yukino. However... for some reason, Yukino takes him to a hotel, and he crosses the line as she leads him on...! Asaton has been struggling with his relationship with Yukino since that day, but when his father remarries, Yukino becomes his sister-in-law...!

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