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Unlike her sister Yozora Reira (voiced by Erika MatsuWell), who is the Student Council president and constantly in the spotlight at school, Yozora Momiji (voiced by Haruka Terui) can only be described as "average" in both appearance and personality. However, on her 16th birthday, two unexpected visitors at home completely changed Momiji's peaceful life. The silent and low-profile Sannomiya Shira (voiced by Wataru Hatano) and his sister Sannomiya Majo (voiced by Yuri Yoshida), who is arrogant and strong-willed, became guests in Momiji's home. Shockingly, Shira is revealed to be Momiji's betrothed. Furthermore, Shira becomes a transfer student in Momiji's class, constantly following her around at school as well! With two new people suddenly living in the house, everything becomes more complicated and troublesome. How will Momiji handle this unexpected situation?