In 16th century Japan, a noblewoman who is destined to inherit the throne, and a celebrated, high-ranking military officer, are drawn together by an uncommon encounter, which leads to a forbidden love. Kaede Minamato, the last surviving heir to the Owari province, after the assassination of her family, is entangled in political matters, which she cares little about. Refusing countless suitors, whom she knows only want her kingdom, she finds solace in painting – her only escape from her royal duties. Her kingdom falters under the eye of her evil uncle, Lord Nobuhiro Minamoto, and the pressures of a forced marriage to the cunning Prince Takemaru of the neighboring Mikawa province. Ryoichi Takahashi is a brave man of unshakable discipline, but holds down a burden of sorrows. Haunted by a decision that cost countless lives, he seeks redemption by protecting the vulnerable. His hunt for the Haganaki leads him to Kaede's carriage; their lives become entwined in ways neither could foresee. Beneath the Red Throne is a tale of betrayal, honor, duty, and sacrifice.