Netorare Tsuihousareta Saikyou Kishi Danchou no Ossan, Katainaka de Eiyuu ni Matsuriagerareru

For years, the commander of the knights, Warrena, has contributed to keeping the kingdom at peace. Despite surviving a year-long campaign, his fiancée, the third princess, became pregnant on top of having an affair. In order to cover up the family scandal, the royal family declared that Warrena had passed away during the campaign.