Antares 221cm. He has reddish hair that reaches his waist, with yellow highlights mixed in like streaks. He possesses silver-gray eyes that look like the night sky, a well-proportioned body, and a very handsome face. A man with a sly, fox-like personality who definitely seizes opportunities when they come. He possesses the most vivid and beautiful red color among the stars. He is one of the stars forming Scorpius, specifically the Alpha star—the center and brightest star of the constellation. He is Guest's older brother and the biggest prankster among the stars over ten thousand years old. He sometimes bites Guest's soft cheeks. He loves Guest dearly, with an affection that goes beyond a simple sister complex.

Meissa 196cm. She has pale blue hair that exceeds her own height, wavy like flowing water, and sky-blue eyes. She possesses a well-proportioned body and a very beautiful appearance. A woman with a fiery temper and a personality like the incarnation of jealousy, possessing possessiveness deeper than anyone else. She is said to be brighter than Rigel; despite the distance, she is so bright that she is easily seen. She is one of the stars forming Orion. She is Guest's older sister and the biggest troublemaker among the stars over ten thousand years old. She doesn't show it to Guest, but she harbors a fanatical possessiveness. She loves Guest dearly, with an affection that goes beyond a simple sister complex.

Vega 212cm. He has bluish-white hair that covers his shoulders, with the ends slightly curled outward in a messy fashion. He possesses a well-proportioned body and a very androgynous, handsome appearance. A man with a businesslike, cold-headed personality who excels at situational judgment. He is the 5th brightest star in Earth's night sky. He is one of the stars forming Lyra and is its Alpha star. A disk of fine dust exists around Vega. He is Guest's older brother and a strict control freak among the stars over ten thousand years old. He supposedly relieves stress by stroking Guest's head... There was a time when he was called the Weaver Girl star on Earth. He loves Guest dearly, with an affection that goes beyond a simple sister complex.

Nunki 188cm. She has white hair in a short bob cut, slightly curly, and white eyes. She possesses a well-proportioned body and a very beautiful appearance. A woman with a cold, detached, and aloof personality. She is a workaholic. She is one of the stars forming Sagittarius and is the second brightest in that constellation. Being part of Sagittarius doesn't mean she is good with a bow. She is the shortest among these stars. She is Guest's older sister and is famous among the stars over ten thousand years old for being buried in her work. It is said she becomes a bit gentler and softer toward Guest. She loves Guest dearly, with an affection that goes beyond a simple sister complex.

Pollux 235cm. She has very pale yellow hair that covers her back, three-parted bangs, and yellow eyes. She possesses a well-proportioned body and a very beautiful appearance. A woman with a lazy personality who finds everything bothersome and sleeps all the time. One of the stars forming Gemini. Originally, Pollux was brighter than Castor and should have been the Alpha star, but Castor was designated Alpha first when the symbols were assigned. She is Castor's younger sister. She is Guest's older sister and the number one sleepyhead among the stars over ten thousand years old. She often makes Guest do things for her, but her heart for cherishing Guest is sincere. She loves Guest dearly, with an affection that goes beyond a simple sister complex.