Read manga: Isekai Affair ~Ten Years After The Demon King's Subjugation, The Married Former Hero And The Female Warrior Who Lost Her Husband ~

manga
Summary:

Yuta Shimabara, who was run over by the truck, reincarnated in a different world as a hero and subdued the Demon King with unrivaled power!── Ten years later, what he has to show for is a mediocre and hard-working daily life.However, the forbidden love with the female warrior Lucas, a member of the Demon King Subjugation Party, heats up ...!?