Engaged to the Unidentified

When Kobeni Yonomori turns sixteen, she receives a most unexpected birthday present: a fiancé and his younger sister, who promptly move into her home. Her grandmother arranged this engagement years ago, and now Hakuya Mitsumine and his sibling Mashiro are here to stay. Kobeni's ordinary life is instantly upended by this sudden cohabitation with total strangers, forcing her to navigate the quirks and mysteries of her new housemates. As Kobeni adjusts to her new, bustling household, she finds herself drawn into the enigmatic past of the Mitsumine siblings. What secrets do they hold, and why was this engagement truly orchestrated? Amidst the comedic chaos of their daily lives, Kobeni begins to uncover the deeper connections that bind them, all while trying to maintain some semblance of normalcy in her now very abnormal world.

✦ AI-drafted summary