Ep. 1: Kobeni meets her new fiancé Hakuya and his sister Mashiro who move in with her family.

Sixteen-year-old Kobeni Yonomori is stunned to discover she has an arranged fiancé named Hakuya Mitsumine. Hakuya and his younger sister Mashiro move into Kobeni's home, where they live alongside Kobeni's older sister, Benio. While Kobeni struggles to recall any connection to Hakuya, Mashiro becomes the target of Benio's excessive affection for her brother. The situation shifts when both Hakuya and Mashiro enroll in Kobeni's school class. Mashiro is surprised to observe that Benio displays a completely different personality in the school environment compared to her behavior at home, creating a complex dynamic among the new residents and their sister.

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