I'm a Demon Lord. My Second Marriage was with the Hero's Mother, and the Hero Became my Step-Daughter. (Associated Names)

Demon Lord Galtau Leuzen was attacked at the Demon Lord’s Castle by the hero’s party, but quickly turned the tables on them. After they were all knocked out, the kind-hearted demon lord returned them all to their families, which was when he had a fateful encounter: He instantly fell for the hero’s mother, Laetia, a…