On the weekend, my little sister comes to Tokyo to see me. "How are you, big brother? We finally got to meet!" Reuniting with Natsuki, who has grown into a beautiful girl who looks good in her uniform, reminds me of the forbidden relationship we had when we still lived together as a family. As soon as we got to my room, brother and sister became man and woman, engaging in passionate, passionate, and lustful sexual acts that evoke love over and over again. "Big brother, you came out a lot of sperm!"