Engaged to the Unidentified

Engaged to the Unidentified

Yonomi Kobeni, an ordinary girl, finds out on her 16th birthday that she is betrothed to Mitsumine Hakuya, a boy the same age as her. Hakuya moves in from the countryside and starts living with her, bringing his younger sister who is still a primary school student with him. Also added is his older sister who is already living with Kobeni and is two years older.