Takuma used the XX sound that he got by chance to defile Megumi, who was a longing girl, as he wanted.
The next thing Takuma noticed was his younger sister Shizuka.
Shizuka continues to take a cold attitude to her brother Takuma because of her physiological disgust.
Takuma, who tricked his naive younger sister into hearing the sound, deprives her of her physical freedom and begins to dig into her undeveloped chest.
Shizuka, whose consciousness is clear, casts a tight word on Takuma, but it sounds comfortable to Takuma now.