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As a first-year Ronin, I decided to stay at my aunt Aika's house in order to attend a prep school in Tokyo. However, to be honest, I don't like Aika. Gorgeous SNS, live streaming, etc...Aika spends her time leisurely, putting aside housework. Moreover, he treated me like a failure and a virgin. I was deeply angry and started following Aika-san in order to grasp her weakness. Then one day, she witnesses her disappearing into a hotel with a man. When I saw that, I carried out a certain plan...