Koisuru Alpha no Sodatekata

The respected Kamimura clan holds high regard for their gifted offspring, but Nio, the sole omega in a family line of alphas, lacks this privilege. After the tragic demise of his brother Reo and sister-in-law Ruri, Nio returns to the home he once left behind, and his late relatives' children bring the past rushing back, especially Suou, who inherited his brother's talents despite not being related by blood. What unfolds when these dissimilar kin start a new life together?