My father remarried and I got a new step-sister. My father went on a remarriage trip in high spirits, so I spent my days alone with my step-sister, who I still don't know well. My step-sister suddenly kissed me and had a strange way of getting closer to me. Meanwhile, when Aima was feeling down after being dumped by her boyfriend, she let her sister-in-law take care of her and was led into a forbidden relationship. Aima, who could only think about her step-sister, finally...