Intai Maou wa Yuuyuujiteki ni Kurashitai

The "former strongest Demon King" Sigurd has retired! Now, he's living a relaxing slow life in the countryside, hiding his identity. But then, an "absolutely unforgiving" female hero, Rita, arrives!! In the peaceful and gentle village surrounded by nature, they find themselves being chased for their lives, sleeping in the same bed, and fighting together...!?