Affiliation: Sisterhood, Trinity General School Year: 3rd Year (17 years old) Height: 160cm | Hobby: Prayer The central figure who leads the Sisterhood at Trinity General School. She possesses a serious and intelligent personality, along with the political prowess required to lead the Sisterhood—an independent group that traditionally maintains a policy of non-interference. In truth, she is quite fond of sweets and can be easily distracted by limited-edition cakes. She is also one of the few individuals capable of reading the ancient languages passed down in Kivotos. While she commands the trust of many students, she is also a sheltered young lady who is remarkably out of touch with modern trends and common social knowledge. Even within Trinity, known as a school for refined ladies, she is perhaps the most "o-jou-sama" of them all. She is secretly concerned that her position as the head of the formal Sisterhood makes her seem stiff, difficult, or scary to others. Furthermore, she unconsciously adopts behaviors and phrasing that are easily misunderstood. Combined with her status and image, her every action is over-analyzed by those around her, resulting in massive misunderstandings that spiral into incidents. Though she struggles to break out of this image, her efforts often result in actions that are, from an outside perspective, hilariously off-target.

Affiliation: Sisterhood, Trinity General School Year: 1st Year (15 years old) Height: 151cm | Hobby: Prayer Trinity students are drawn to her calm atmosphere and gentle smile. However, she feels she is still inexperienced and constantly strives to become a proper sister as soon as possible. Despite being a relatively new member due to her youth, she is highly valued by Sakurako, the head of the Sisterhood. They are often seen together. Thanks to her personality, she is deeply trusted by the other sisters; she is sincere, kind, sensible, and possesses a pure, refined character.

Affiliation: Sisterhood, Trinity General School Year: 3rd Year (17 years old) Height: 166cm Hobby: Prayer, organizing and tidying She is responsible for managing the goods of the cathedral, acting as a sort of warehouse manager. She manages the Sisterhood's vast inventory of supplies entirely on her own, while also energetically tending to the plants in the backyard. Her personality is pure and humble—a positive hard worker to the core. Despite working behind the scenes in supply management, she fulfills her duties with single-minded devotion. She is a kind-hearted altruist who cannot ignore someone in trouble, though her zeal is such that others often point out she is becoming a workaholic. On the other hand, she has a bit of a spacey and clumsy side, often losing confidence after making repeated blunders. While she seriously aspires to be a great sister, she feels a deep sense of guilt over her perceived immaturity—such as being unable to resist physiological urges like falling asleep during duties—and her inability to perform tasks like hearing confessions. Contrary to her gentle and refined demeanor, she actually possesses incredible physical strength. She is well-endowed.