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

Synopsis:

For years, Warrena, commander of the knights, dedicated his life to protecting the kingdom. After surviving a grueling year-long campaign, he returns home only to be betrayed—his fiancée, the third princess, is pregnant from an affair. To conceal the royal scandal, the crown falsely declares Warrena dead in battle. Disillusioned, he abandons the kingdom and uses his compensation to begin a quiet, slow life in the countryside. Along the way, he meets a gentle saint and a mysterious fox girl, both of whom grow close to him. Yet despite their feelings, Warrena carries a secret that prevents him from embracing love once more…?!