Mikakunin de Shinkoukei

On her sixteenth birthday, Kobeni Yonomori learns that her late grandfather arranged her engagement years ago to a boy named Hakuya Mitsumine. The bigger surprise is that Hakuya immediately moves into her home with his younger sister Mashiro, while Kobeni's mother and overprotective sister Benio treat the situation as strangely normal. Hakuya is so quiet that his feelings are difficult to read, and Kobeni cannot even remember the childhood meeting that supposedly connected them. Between school life and household chaos, she begins discovering that the Mitsumine family hides unusual secrets and that an engagement arranged by adults may eventually become a relationship she chooses for herself.