Dariel, a dark soldier who was in the Demon King's army but could not use magic, climbed up to the position of assistant to the Four Heavenly Kings with his intelligence and action. However, as soon as the Four Heavenly Kings changed, Dariel was fired. Disappointed, Dariel wandered in the forest and accidentally met a girl who was attacked by a monster! Dariel, who saved the girl, came to the human village under the girl's "hospitality". Dariel wanted to slip away before exposing himself as a demon, but at the girl's "request", he stayed and began his adventure. "It's not that I don't want to refuse, it's just that she is too big."