This weekend, my sister is coming to Tokyo to see me. "How are you, big brother? It's so good to finally see you!" Reuniting with Natsuki, who has grown into a beautiful girl who looks great in her school uniform, reminds me of the forbidden relationship we had when we still lived as a family. As soon as we get to my room, brother and sister become like man and woman, and we repeatedly engage in intense, passionate, and lewd sexual acts filled with love. "You've released so much of your sperm, big brother!"