Shin Shiranui (voiced by Yoshitsugu Matsuoka) is a first-year junior high school student. Since she was a child, she has longed to become a magician. Hoshisato Kana (voiced by Aina Suzuki) is Shin's childhood friend, and her father is the famous magician Hoshisato Mamoru (voiced by Yoshimasa Hosoya). In order to learn from her master, Shin came to Rina's house, only to find that Rina had a stay-at-home sister named Yume (voiced by Miyu Tomita). Because Hoshisato Mamoru is always away from home because he has to participate in a world tour, and Rina is a reckless person with zero female power, Shin accidentally became the trainee housekeeper of the Hoshisato family. There is a magic thief called "Phantom" active in the city, and Shin's nickname for Rina is also "Phantom". Are there any connections between the two?