When I lived with my sister, we were actually in a romantic relationship, trying to hide it from our parents. But this relationship was wrong. Thinking that it would be dangerous if we got any deeper, I fled home, and our dangerous relationship came to an end. However, a few years later, when I returned home, I found my sister, even cuter than before. The repressed feelings for each other welled up within us, and we desperately tried to resist the urge to go back to our previous relationship, intending to end it with just a kiss. However, with that single kiss, time that had stopped moving again began. As if to make up for the gap that had existed until then, the two passionately pursued each other. Now that we'd both grown up, our sexual knowledge and bodies allowed us to have real sex, different from what we had back then, providing the ultimate physical pleasure and drawing me into a forbidden quagmire. The dangerous relationship between this innocent yet deranged brother and sister begins anew.