User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170307010853/@comment-30924344-20170307211259

Maybe Issei has a son and daughter with all his wives. Then that would make up the 22 children. I would like in the Millicas spin-off story [hope it's a full series like DxD], for like it to be confirmed on these uknown women Issei's marries making his children 22+.