Forbidden relationship - incest. The little sister's body is becoming more and more adult. The brother can no longer endure the unbalanced sex appeal of the adolescent Kokoro and body, and goes to his sister's bedroom! The lewd bodies and innocent reactions of four unique little sisters, including a cheeky little sister and a sister with a brother complex, emerge from the darkness! Even if they say they don't want it, what about their bodies and Kokoro? In the end, he inseminates them with a creampie!