User blog comment:Mnzombie/Issei's Peerage/@comment-76.91.15.95-20130509211353/@comment-68.203.220.111-20130510014115

Read the authors notes. He said Isseis story will probably end shortly after he graduates from high school(2-3 arcs or 6-8 more volumes after the current one ends). Doubt there will be any more ratings games best we'd get is an epilogue of how Issei is doing when the author switches to Millicas as the main character. Asia, Xenovia, Koneko and Ravel are a shoe in to be in his peerage. The rest is up for speculation.