One, is the younger sister of Zero and also an Intoner, one who can use the Power of Song, as well as the main antagonist of Drakengard 3. One is also the main protagonist of Utahime Five. She is the final boss of branches A and C. She is an intellectual and serious by nature with a strong sense of justice, which is the complete opposite of Zero. Due to the difference in their nature, One has a hard time getting along with her elder sister.