Zero
CV: Maaya Uchida
The protagonist. She is an Utautai, one who is gifted with the ability to manipulate magic through songs. There were originally five Utautai, but one day, Zero appeared before One and became the sixth, as well as the eldest of the Utautai, possessing more power than any of her sisters. Her current aim is to kill the rest of the Utautai, stating that only one Utautai is needed but her reason for this is unknown. One calls her a 'traitor' because of this. Zero is very open about sex, and thinks nothing of having relationships with multiple partners. She is lazy and violent, making her a polar opposite of One, who is overearnest. Zero has a prosthetic left arm, and possesses a mysterious body, with a distinctive long-living flower growing out of her right eye. Her skills with the sword are beyond human capabilities.

One
CV: Rie Tanaka
Zero's younger sister, and fellow Utautai. She is intellectual and serious by nature. She wonders how she can use her abilities to help the world, making her the complete opposite of Zero. Due to this, One has a hard time getting along with her elder sister. She is also the one that stands at the top of the Utautai, as well as the most powerful until Zero's appearance.

Two
CV: Chiwa Saitō
The third of the sisters, as well as the one who governs the country of sand. The mood maker presence of the Utautai sisters, she has a cheerful and bright disposition that allows her to get along easily with anyone. She currently has a lover.

Three
CV: Mamiko Noto
The fourth of the sisters, as well as the one who governs the country of forest, Three is popular with a certain soldier demographic. She is also the one that made Zero into the eldest sister of the Utautai. Always appearing to be lethargic, she has a dangerous temperament that is usually quiet and stable, but can explode with fury at times. She does not care for anything that does not interest her, but is unnaturally obsessive with things that interest her, such as dolls. Does not care about Zero. Wields two pairs of scissors.

Four
CV: Ayana Taketatsu
The fifth of the sisters, as well as the one who governs the country of mountain. She speaks and acts with grace reminiscent of an honors student, and is a good listener to what others have to say, appearing to be a serious lady on the surface. However, her stiff appearance hides a twisted sense of inferiority. Possesses a high sex drive like the other Utautai, but her repressed personality prevents her from acting upon it. As a result, she is the only virgin among her sisters.

Five
CV: Shizuka Itō
The sixth of the sisters, as well the one who governs the country of sea. She is also the one who made Zero into the one that stands at the top of the six. Five is extremely confident and greedy, wanting to possess everything. However, her interest always die out by the time she gets her hands on the things she wants. She likes to use lewd language in her speech, and likes to allude to her sex life. Her greed knows no bounds, even her sister, Zero, is made into an object of interest.