Engaged to the Unidentified

On her 16th birthday, Kobeni Yonomori’s quiet routine is upended when she learns she has a fiancé—and a sister-in-law—she’s never met. Bound by an arrangement made by her late grandfather, Hakuya Mitsumine and his younger sister Mashiro leave their rural home and move in with the Yonomori family, turning Kobeni’s home and school life into unfamiliar territory overnight.

Engaged to the Unidentified follows Kobeni as she navigates an unexpectedly formal engagement with the reserved Hakuya while adjusting to Mashiro’s presence and the new family dynamic. As time passes, unusual truths about the Mitsumine siblings begin to surface, adding a supernatural edge to Kobeni’s already complicated new normal.