Liberation Maiden SIN is a visual novel game that follows the story of Kiyoto Kaido, a young man who has the ability to read others' thoughts. As the Second Liberation War rages on, Kaido embarks on an adventure with his friend Shoko Ozora, the President of Japan.
The game takes place in a world where new female characters have been appointed as cabinet members in the New Japan government. Kaido's unique ability allows him to interact with these characters and uncover their secrets. Along the way, he is joined by other familiar faces, including the Liberator Kamui and the Guardian Spirits.