My brother and sister are always fighting, and my parents are surprised. But in fact, all of these brothers and sisters, Genka, are acting to deceive their parents. In reality, the relationship between the two crosses the boundary between brother and sister and is a lover. That's why I flirt with a little gap that my parents haven't seen, and when my parents go out, I have sex all the time! The sense of immorality that parents should never get caught up in is even more sensitive to each other and addicted to forbidden romance!