TV-Series
Description
Kyouko Kouda is the biological daughter of professional shogi player Masachika Kouda and the older sister of Ayumu Kouda. She becomes the adoptive older sister of the series protagonist, Rei Kiriyama, when he is taken into the Kouda household following the death of his family. She is four years older than Rei.

Kyouko is a young woman of striking appearance, with shoulder-length blonde hair and clear blue eyes. She typically dresses in white or light-colored clothing. Her outward beauty, however, contrasts sharply with her turbulent inner world. She is described as having a fierce and hot-tempered personality, with some in the shogi world cruelly referring to her as a poisonous woman. Rei himself has described her as being like a vehement, angry tempest in her temperament, her beauty, and her approach to shogi.

Kyouko's motivations and personality are deeply rooted in her childhood and her relationship with her father. From a young age, she tirelessly pursued excellence in shogi, not out of pure love for the game, but as a desperate attempt to gain the attention and acknowledgment of her father, Masachika. When Rei, a prodigy, joined the family, he became the recipient of the paternal affection she craved. Seeing his natural talent and the way her father focused on him, Kyouko viewed Rei as an intruder who had stolen her family and her birthright. She was forced to leave the professional shogi apprentice school in her second year of middle school because she could no longer defeat Rei, a final rejection that cemented her feelings of inadequacy and resentment.

In the narrative, Kyouko serves as a complex, antagonistic figure from Rei’s past who continues to haunt his present. Their relationship is mutually destructive, characterized by a cycle of regret, resentment, and a twisted form of deep-seated care that neither can fully sever. After Rei moves out of the Kouda house, she frequently seeks him out, not as a loving sister, but to verbally abuse him, torment his mind, and attempt to destabilize him, often before important shogi matches. She takes a particularly cruel pleasure in taunting him about his relationship with the Kawamoto sisters, insinuating that he will inevitably bring ruin to their warm and welcoming household, just as she believes he did to her own. Despite her cruelty, there are fleeting, poignant moments that reveal the loneliness and pain beneath her caustic exterior. A key memory for Rei involves Kyouko climbing into his bed as a child, warning him, Dont touch me. But dont move away from me, a moment of emotional unity between two deeply unhappy children finding solace in each other in spite of their broken family.

Key relationships in Kyouko's life are defined by conflict and unfulfilled need. Her bond with Rei is the most central, a knot of love, hatred, jealousy, and guilt. Her desperate need for paternal love is constantly rejected by her father, Masachika, which has left a permanent wound. In a destructive attempt to fill this void and to rebel against her family, she begins a relationship with Masamune Gotou, a much older, married shogi player who is a rival of her father. She is fully aware the relationship is based on self-hatred and has no future, but she clings to it, tormenting herself as much as those around her.

Kyouko’s development throughout the story is gradual and marked by a painful, growing self-awareness. While she initially lashes out and places all blame on Rei, she eventually begins to confront the emptiness of her own choices and her role in her own misery. Her relationship with Gotou, and her observance of his devotion to his terminally ill wife, forces her to understand deep loneliness in a new way, leading her to a belated sense of empathy for Rei, who lost his entire family. In a moment of quiet regret, she finally acknowledges that her treatment of Rei was unfair, recognizing that he never intended to steal her family but was simply a lonely boy seeking a place to belong. She works as a temporary employee and remains financially dependent on her father for some time, though she aspires to be independent. Her notable abilities once lay in shogi, where she was a talented and aggressive player, but her professional career was cut short by the trauma of being surpassed by her adoptive brother.