In my first year as a ronin, I decided to stay at my aunt Aika's house to attend a preparatory school in Tokyo. However, to be honest, I don't like Aika. Glittering SNS, live streaming, etc... Aika spends her time leisurely without doing housework. Moreover, she has treated me as a virgin who has not been able to do it. I was really angry and started tailgating to grasp Aika's weakness. - And one day, she witnesses her disappearing into a hotel with a man. When I saw that, I carried out a certain plan ...