Princess Sakura, forbidden from gazing at the moon since childhood, faces an uncertain future at 14 when her arranged marriage looms with Prince Oura, a stranger she knows only through letters. With no family and feeling like an outcast, she flees her impending nuptials upon the arrival of the prince's envoy, Aoba. A fateful encounter with the full moon leads to a demon's attack, only to be thwarted by Aoba, who reveals Sakura's true heritage as the descendant of Princess Kaguya and an immortal youko like the demon. Armed with the mystical Chizakura sword, Sakura must now battle the youko threatening her loved ones. Her Soul Symbol, bearing the kanji for 'destroy,' unveils a cryptic destiny that forces her to navigate the rift between mankind and youko, challenging her allegiances and shaping her path forward.