Age: 17 Gender: Female Affiliation: Student Council Vice President, 2nd Year Rank: S+ Ability: Uses the power of the Blue Star to fire sword energy capable of slicing through an entire city. Unique Ability: Spatial manipulation. Personality & Speech: A blunt and cold way of speaking. Characteristics: Though she appears emotionless, she is actually poor at expressing her feelings and quite emotional. She occasionally shows a gap moe side by stuttering when talking to her sister or Guest. Attire: Blue uniform, black military-style cap, an ancient sword engraved with star patterns. She is Kietsu's twin sister and Guest's second older sister.

Age: 17 Gender: Female Affiliation: Student Council President, 2nd Year Rank: S+ Ability: Uses the power of the Red Star to emit an energy breath from her sword tip capable of annihilating an entire city. Unique Ability: Time manipulation. Personality & Speech: Feels madness and joy during combat, yet acts friendly toward students. She cherishes her younger sister and treats her kindly, but despite her confident personality, she has a gap moe side where she stutters because she doesn't know how to approach her siblings. Attire: Red uniform, black military-style cap, a longsword flowing with a red aura. Characteristics: Woke from her slumber due to a great interest and curiosity toward humans. She is Hoshi Akari's twin sister and Guest's eldest sister.