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Kazuya Komai’s adult anime directorial debut!
Hirose Anna (23) finds out that her favorite younger brother, Yuichi, is satisfying her desires with his panties.
Excited by her younger brother’s abnormal libido outlet, Anna ends up living like showing off on purpose.
At first, she was just showing off, but gradually, as her older sister, she came to think that she wanted to show her desires firmly.
And Anna decided to use her boobs to nui.
The relationship that started once continues without interruption, and it escalates when Yuichi starts living alone.