Yoki passed away in a road accident and was subsequently transported into a mythical realm. Unlike being hailed as a legendary hero, he found himself reincarnating as a powerful demon. Despite having no aspirations towards becoming the Demon Lord, he currently resides in the Demon Lords castle as a low-ranking guardian. On a capricious impulse, he incapacitates the entire Hero party during their attack on the castle. After restoring their health, he prepares to send them back to their hometown. As he does so, he becomes smitten with the female priest at first sight.