Despite her tragic past and speech impediment, middle schooler Shion Yasuoka defies expectations by excelling in the competitive world of professional shogi. Encouraged by her supportive adoptive family and the shogi community, she catches the eye of Satoru Hani, the brother of the reigning shogi champion. Satoru proposes a groundbreaking tournament that challenges traditional gender roles in shogi and urges Shion to join. However, his deep knowledge of Shion's history raises suspicions among her friend Ayumi Saitou and the authorities investigating her family's demise. As the tournament unfolds, memories of her painful past resurface, pushing Shion to confront her inner demons and outwit those responsible for her suffering.